diff --git a/app/models/ban.rb b/app/models/ban.rb
new file mode 100644
index 000000000..370be1495
--- /dev/null
+++ b/app/models/ban.rb
@@ -0,0 +1,53 @@
+class Ban < ActiveRecord::Base
+  after_create :update_feedback
+  belongs_to :user
+  belongs_to :banner, :class_name => "User"
+  attr_accessible :reason, :duration, :user_id
+  validate :user_is_inferior
+  
+  def self.is_user_banned?(user)
+    exists?(["user_id = ? AND expires_at > ?", user.id, Time.now])
+  end
+  
+  def self.is_ip_banned?(ip_addr)
+    exists?(["ip_addr = ? AND expires_at > ?", ip_addr, Time.now])
+  end
+  
+  def user_is_inferior
+    if user
+      if user.is_admin?
+        errors[:base] << "You can never ban an admin."      
+        false
+      elsif user.is_moderator? && banner.is_admin?
+        true
+      elsif user.is_moderator?
+        errors[:base] << "Only admins can ban moderators."
+        false
+      elsif banner.is_admin? || banner.is_moderator?
+        true
+      else
+        errors[:base] << "No one else can ban."
+        false
+      end
+    end
+  end
+  
+  def update_feedback
+    if user
+      feedback = user.feedback.build
+      feedback.is_positive = false
+      feedback.body = "Banned: #{reason}"
+      feedback.creator_id = banner_id
+      feedback.save
+    end
+  end
+  
+  def duration=(dur)
+    self.expires_at = dur.to_i.days.from_now
+    @duration = dur
+  end
+  
+  def duration
+    @duration
+  end
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index 248b1786c..73bbe238d 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -12,6 +12,8 @@ class User < ActiveRecord::Base
   validates_confirmation_of :password
   before_save :encrypt_password
   after_save :update_cache
+  before_create :normalize_level
+  has_many :feedback, :class_name => "UserFeedback", :dependent => :destroy
   scope :named, lambda {|name| where(["lower(name) = ?", name])}  
   
   module NameMethods
@@ -92,10 +94,29 @@ class User < ActiveRecord::Base
     end
   end
   
+  module LevelMethods
+    def normalize_level
+      if is_admin?
+        self.is_moderator = true
+        self.is_janitor = true
+        self.is_contributor = true
+        self.is_privileged = true
+      elsif is_moderator?
+        self.is_janitor = true
+        self.is_privileged = true
+      elsif is_janitor?
+        self.is_privileged = true
+      elsif is_contributor?
+        self.is_privileged = true
+      end
+    end
+  end
+  
   include NameMethods
   include PasswordMethods
   extend AuthenticationMethods
   include FavoriteMethods
+  include LevelMethods
 
   def can_update?(object, foreign_key = :user_id)
     is_moderator? || is_admin? || object.__send__(foreign_key) == id
diff --git a/app/models/user_feedback.rb b/app/models/user_feedback.rb
new file mode 100644
index 000000000..9a7b132b0
--- /dev/null
+++ b/app/models/user_feedback.rb
@@ -0,0 +1,5 @@
+class UserFeedback < ActiveRecord::Base
+  set_table_name "user_feedback"
+  belongs_to :user
+  attr_accessible :body, :user_id, :is_positive
+end
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index d531b8bb8..8422db461 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,10 +1,3 @@
-# Be sure to restart your server when you modify this file.
-
-# Add new inflection rules using the following format 
-# (all these examples are active by default):
-# ActiveSupport::Inflector.inflections do |inflect|
-#   inflect.plural /^(ox)$/i, '\1en'
-#   inflect.singular /^(ox)en/i, '\1'
-#   inflect.irregular 'person', 'people'
-#   inflect.uncountable %w( fish sheep )
-# end
+ActiveSupport::Inflector.inflections do |inflect|
+  inflect.uncountable %w( feedback )
+end
diff --git a/db/development_structure.sql b/db/development_structure.sql
index 780a59630..1b57cc3dd 100644
--- a/db/development_structure.sql
+++ b/db/development_structure.sql
@@ -250,6 +250,41 @@ CREATE SEQUENCE artists_id_seq
 ALTER SEQUENCE artists_id_seq OWNED BY artists.id;
 
 
+--
+-- Name: bans; Type: TABLE; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE TABLE bans (
+    id integer NOT NULL,
+    user_id integer,
+    ip_addr inet,
+    reason text NOT NULL,
+    banner_id integer NOT NULL,
+    expires_at timestamp without time zone NOT NULL,
+    created_at timestamp without time zone,
+    updated_at timestamp without time zone
+);
+
+
+--
+-- Name: bans_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE bans_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MAXVALUE
+    NO MINVALUE
+    CACHE 1;
+
+
+--
+-- Name: bans_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE bans_id_seq OWNED BY bans.id;
+
+
 --
 -- Name: comment_votes; Type: TABLE; Schema: public; Owner: -; Tablespace: 
 --
@@ -1000,6 +1035,40 @@ CREATE SEQUENCE uploads_id_seq
 ALTER SEQUENCE uploads_id_seq OWNED BY uploads.id;
 
 
+--
+-- Name: user_feedback; Type: TABLE; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE TABLE user_feedback (
+    id integer NOT NULL,
+    user_id integer NOT NULL,
+    creator_id integer NOT NULL,
+    is_positive boolean NOT NULL,
+    body text NOT NULL,
+    created_at timestamp without time zone,
+    updated_at timestamp without time zone
+);
+
+
+--
+-- Name: user_feedback_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE user_feedback_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MAXVALUE
+    NO MINVALUE
+    CACHE 1;
+
+
+--
+-- Name: user_feedback_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE user_feedback_id_seq OWNED BY user_feedback.id;
+
+
 --
 -- Name: users; Type: TABLE; Schema: public; Owner: -; Tablespace: 
 --
@@ -1155,6 +1224,13 @@ ALTER TABLE artist_versions ALTER COLUMN id SET DEFAULT nextval('artist_versions
 ALTER TABLE artists ALTER COLUMN id SET DEFAULT nextval('artists_id_seq'::regclass);
 
 
+--
+-- Name: id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE bans ALTER COLUMN id SET DEFAULT nextval('bans_id_seq'::regclass);
+
+
 --
 -- Name: id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -1309,6 +1385,13 @@ ALTER TABLE unapprovals ALTER COLUMN id SET DEFAULT nextval('unapprovals_id_seq'
 ALTER TABLE uploads ALTER COLUMN id SET DEFAULT nextval('uploads_id_seq'::regclass);
 
 
+--
+-- Name: id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE user_feedback ALTER COLUMN id SET DEFAULT nextval('user_feedback_id_seq'::regclass);
+
+
 --
 -- Name: id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -1370,6 +1453,14 @@ ALTER TABLE ONLY artists
     ADD CONSTRAINT artists_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: bans_pkey; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace: 
+--
+
+ALTER TABLE ONLY bans
+    ADD CONSTRAINT bans_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: comment_votes_pkey; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace: 
 --
@@ -1546,6 +1637,14 @@ ALTER TABLE ONLY uploads
     ADD CONSTRAINT uploads_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: user_feedback_pkey; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace: 
+--
+
+ALTER TABLE ONLY user_feedback
+    ADD CONSTRAINT user_feedback_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: users_pkey; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace: 
 --
@@ -1647,6 +1746,27 @@ CREATE UNIQUE INDEX index_artists_on_name ON artists USING btree (name);
 CREATE INDEX index_artists_on_other_names_index ON artists USING gin (other_names_index);
 
 
+--
+-- Name: index_bans_on_expires_at; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_bans_on_expires_at ON bans USING btree (expires_at);
+
+
+--
+-- Name: index_bans_on_ip_addr; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_bans_on_ip_addr ON bans USING btree (ip_addr);
+
+
+--
+-- Name: index_bans_on_user_id; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_bans_on_user_id ON bans USING btree (user_id);
+
+
 --
 -- Name: index_comment_votes_on_user_id; Type: INDEX; Schema: public; Owner: -; Tablespace: 
 --
@@ -1962,6 +2082,13 @@ CREATE UNIQUE INDEX index_tags_on_name ON tags USING btree (name);
 CREATE INDEX index_unapprovals_on_post_id ON unapprovals USING btree (post_id);
 
 
+--
+-- Name: index_user_feedback_on_user_id; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_user_feedback_on_user_id ON user_feedback USING btree (user_id);
+
+
 --
 -- Name: index_users_on_email; Type: INDEX; Schema: public; Owner: -; Tablespace: 
 --
@@ -2086,4 +2213,8 @@ INSERT INTO schema_migrations (version) VALUES ('20100215223541');
 
 INSERT INTO schema_migrations (version) VALUES ('20100215224629');
 
-INSERT INTO schema_migrations (version) VALUES ('20100215224635');
\ No newline at end of file
+INSERT INTO schema_migrations (version) VALUES ('20100215224635');
+
+INSERT INTO schema_migrations (version) VALUES ('20100215225710');
+
+INSERT INTO schema_migrations (version) VALUES ('20100215230642');
\ No newline at end of file
diff --git a/db/migrate/20100215225710_create_bans.rb b/db/migrate/20100215225710_create_bans.rb
new file mode 100644
index 000000000..2031e2caa
--- /dev/null
+++ b/db/migrate/20100215225710_create_bans.rb
@@ -0,0 +1,20 @@
+class CreateBans < ActiveRecord::Migration
+  def self.up
+    create_table :bans do |t|
+      t.column :user_id, :integer
+      t.column :ip_addr, "inet"
+      t.column :reason, :text, :null => false
+      t.column :banner_id, :integer, :null => false
+      t.column :expires_at, :datetime, :null => false
+      t.timestamps
+    end
+    
+    add_index :bans, :user_id
+    add_index :bans, :ip_addr
+    add_index :bans, :expires_at
+  end
+
+  def self.down
+    drop_table :bans
+  end
+end
diff --git a/db/migrate/20100215230642_create_user_feedback.rb b/db/migrate/20100215230642_create_user_feedback.rb
new file mode 100644
index 000000000..27a7f8fbb
--- /dev/null
+++ b/db/migrate/20100215230642_create_user_feedback.rb
@@ -0,0 +1,17 @@
+class CreateUserFeedback < ActiveRecord::Migration
+  def self.up
+    create_table :user_feedback do |t|
+      t.column :user_id, :integer, :null => false
+      t.column :creator_id, :integer, :null => false
+      t.column :is_positive, :boolean, :null => false
+      t.column :body, :text, :null => false
+      t.timestamps
+    end
+    
+    add_index :user_feedback, :user_id
+  end
+
+  def self.down
+    drop_table :user_feedback
+  end
+end
diff --git a/test/factories/ban.rb b/test/factories/ban.rb
new file mode 100644
index 000000000..c7a37f859
--- /dev/null
+++ b/test/factories/ban.rb
@@ -0,0 +1,6 @@
+Factory.define(:ban) do |f|
+  f.user {|x| x.association(:user)}
+  f.banner {|x| x.association(:admin_user)}
+  f.reason {Faker::Lorem.words}
+  f.duration 60
+end
diff --git a/test/unit/ban_test.rb b/test/unit/ban_test.rb
new file mode 100644
index 000000000..13bd8fa05
--- /dev/null
+++ b/test/unit/ban_test.rb
@@ -0,0 +1,170 @@
+require File.dirname(__FILE__) + '/../test_helper'
+
+class BanTest < ActiveSupport::TestCase
+  context "A ban" do
+    context "created by an admin" do
+      setup do
+        @banner = Factory.create(:admin_user)
+      end
+      
+      teardown do
+        @banner = nil
+      end
+      
+      should "not be valid against another admin" do
+        user = Factory.create(:admin_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+      end
+      
+      should "be valid against anyone who is not an admin" do
+        user = Factory.create(:moderator_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:janitor_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:contributor_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:privileged_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+      end
+    end
+    
+    context "created by a moderator" do
+      setup do
+        @banner = Factory.create(:moderator_user)
+      end
+      
+      teardown do
+        @banner = nil
+      end
+      
+      should "not be valid against an admin or moderator" do
+        user = Factory.create(:admin_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+
+        user = Factory.create(:moderator_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+      end
+      
+      should "be valid against anyone who is not an admin or a moderator" do
+        user = Factory.create(:janitor_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:contributor_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:privileged_user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+
+        user = Factory.create(:user)
+        ban = Factory.create(:ban, :user => user, :banner => @banner)
+        assert(ban.errors.empty?)
+      end
+    end
+    
+    context "created by a janitor" do
+      setup do
+        @banner = Factory.create(:janitor_user)        
+      end
+      
+      teardown do
+        @banner = nil
+      end
+      
+      should "always be invalid" do
+        user = Factory.create(:admin_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+
+        user = Factory.create(:moderator_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+
+        user = Factory.create(:janitor_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+
+        user = Factory.create(:contributor_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+
+        user = Factory.create(:privileged_user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+
+        user = Factory.create(:user)
+        ban = Factory.build(:ban, :user => user, :banner => @banner)
+        ban.save
+        assert(ban.errors.any?)
+      end
+    end
+
+    should "initialize the expiration date" do
+      user = Factory.create(:user)
+      admin = Factory.create(:admin_user)
+      ban = Factory.create(:ban, :user => user, :banner => admin)
+      assert_not_nil(ban.expires_at)
+    end
+    
+    should "update the user's feedback" do
+      user = Factory.create(:user)
+      admin = Factory.create(:admin_user)
+      assert(user.feedback.empty?)
+      ban = Factory.create(:ban, :user => user, :banner => admin)
+      assert(!user.feedback.empty?)
+      assert(!user.feedback.last.is_positive?)
+    end
+  end
+
+  context "Searching for a ban" do
+    context "by user id" do
+      should "not return expired bans" do
+        admin = Factory.create(:admin_user)
+
+        user = Factory.create(:user)
+        ban = Factory.create(:ban, :user => user, :banner => admin, :duration => -1)
+        assert(!Ban.is_user_banned?(user))
+
+        user = Factory.create(:user)
+        ban = Factory.create(:ban, :user => user, :banner => admin, :duration => 1)
+        assert(Ban.is_user_banned?(user))
+      end
+    end
+    
+    context "by ip address" do
+      should "not return expired bans" do
+        admin = Factory.create(:admin_user)
+        
+        ban = Factory.create(:ban, :ip_addr => "1.2.3.4", :banner => admin, :duration => -1)
+        assert(!Ban.is_ip_banned?("1.2.3.4"))
+
+        ban = Factory.create(:ban, :ip_addr => "5.6.7.8", :banner => admin, :duration => 1)
+        assert(Ban.is_ip_banned?("5.6.7.8"))
+      end
+    end
+  end
+end
diff --git a/test/unit/user_feedback_test.rb b/test/unit/user_feedback_test.rb
new file mode 100644
index 000000000..949cfe1b4
--- /dev/null
+++ b/test/unit/user_feedback_test.rb
@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class UserFeedbackTest < ActiveSupport::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end
diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index 9a5ac94a0..aa5dd7d2d 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -14,6 +14,49 @@ class UserTest < ActiveSupport::TestCase
       assert(!User.authenticate_hash(@user.name, "xxxx"), "Authentication should not have succeeded")
     end
     
+    should "normalize its level" do
+      user = Factory.create(:user, :is_admin => true)
+      assert(user.is_moderator?)
+      assert(user.is_janitor?)
+      assert(user.is_contributor?)
+      assert(user.is_privileged?)
+      
+      user = Factory.create(:user, :is_moderator => true)      
+      assert(!user.is_admin?)
+      assert(user.is_moderator?)
+      assert(user.is_janitor?)
+      assert(!user.is_contributor?)
+      assert(user.is_privileged?)
+
+      user = Factory.create(:user, :is_janitor => true)      
+      assert(!user.is_admin?)
+      assert(!user.is_moderator?)
+      assert(user.is_janitor?)
+      assert(!user.is_contributor?)
+      assert(user.is_privileged?)
+
+      user = Factory.create(:user, :is_contributor => true)      
+      assert(!user.is_admin?)
+      assert(!user.is_moderator?)
+      assert(!user.is_janitor?)
+      assert(user.is_contributor?)
+      assert(user.is_privileged?)
+
+      user = Factory.create(:user, :is_privileged => true)      
+      assert(!user.is_admin?)
+      assert(!user.is_moderator?)
+      assert(!user.is_janitor?)
+      assert(!user.is_contributor?)
+      assert(user.is_privileged?)
+
+      user = Factory.create(:user)      
+      assert(!user.is_admin?)
+      assert(!user.is_moderator?)
+      assert(!user.is_janitor?)
+      assert(!user.is_contributor?)
+      assert(!user.is_privileged?)
+    end
+    
     context "name" do
       should "be #{Danbooru.config.default_guest_name} given an invalid user id" do
         assert_equal(Danbooru.config.default_guest_name, User.find_name(-1))