diff --git a/AppKit/AppKit.j b/AppKit/AppKit.j
index e1cad8bd8..0a98e86d1 100644
--- a/AppKit/AppKit.j
+++ b/AppKit/AppKit.j
@@ -93,6 +93,7 @@
 @import "CPToolbarItem.j"
 @import "_CPToolTip.j"
 @import "CPTreeNode.j"
+@import "CPUserDefaultsController.j"
 @import "CPView.j"
 @import "CPViewAnimation.j"
 @import "CPViewController.j"
diff --git a/AppKit/CPUserDefaultsController.j b/AppKit/CPUserDefaultsController.j
new file mode 100644
index 000000000..1b2e81f10
--- /dev/null
+++ b/AppKit/CPUserDefaultsController.j
@@ -0,0 +1,267 @@
+/*
+ * CPUserDefaultsController.j
+ * AppKit
+ *
+ * Portions based on NSUserDefaultsController.m (2009-06-04) in Cocotron (http://www.cocotron.org/)
+ * Copyright (c) 2006-2007 Christopher J. W. Lloyd
+ *
+ * Created by Alexander Ljungberg.
+ * Copyright 2011, WireLoad Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+@import <Foundation/CPString.j>
+@import <AppKit/CPController.j>
+
+var SharedUserDefaultsController = nil;
+
+@implementation CPUserDefaultsController : CPController
+{
+    CPUserDefaults  _defaults           @accessors(readonly, property=defaults);
+    CPDictionary    _initialValues      @accessors(property=initialValues);
+    BOOL            _appliesImmediately @accessors(property=appliesImmediately);
+}
+
++ (id)sharedUserDefaultsController
+{
+    if (!SharedUserDefaultsController)
+        SharedUserDefaultsController = [[CPUserDefaultsController alloc] initWithDefaults:nil initialValues:nil];
+
+    return SharedUserDefaultsController;
+}
+
+- (id)initWithDefaults:(CPUserDefaults)someDefaults initialValues:(CPDictionary)initialValues
+{
+    if (self = [super init])
+    {
+        if (!someDefaults)
+            someDefaults = [CPUserDefaults standardUserDefaults];
+
+        _defaults = someDefaults;
+        _initialValues = [initialValues copy];
+        _appliesImmediately = YES;
+        _valueProxy = [[_CPUserDefaultsControllerProxy alloc] initWithController:self];
+    }
+
+    return self;
+}
+
+- (id)values
+{
+    return _valueProxy;
+}
+
+- (BOOL)hasUnappliedChanges
+{
+    return [_valueProxy hasUnappliedChanges];
+}
+
+- (void)save:(id)sender
+{
+    [_valueProxy save];
+}
+
+- (void)revert:(id)sender
+{
+    [_valueProxy revert];
+}
+
+- (void)revertToInitialValues:(id)sender
+{
+    [_valueProxy revertToInitialValues];
+}
+
+@end
+
+
+var CPUserDefaultsControllerSharedKey = "CPUserDefaultsControllerSharedKey";
+
+@implementation CPUserDefaultsController (CPCoding)
+
+- (id)initWithCoder:(CPCoder)aCoder
+{
+    if ([aCoder decodeBoolForKey:CPUserDefaultsControllerSharedKey])
+        return [CPUserDefaultsController sharedUserDefaultsController];
+
+    self = [super initWithCoder:aCoder];
+
+    if (self)
+    {
+        [CPException raise:CPUnsupportedMethodException reason:@"decoding of non-shared CPUserDefaultsController not implemented"];
+    }
+
+    return self;
+}
+
+- (void)encodeWithCoder:(CPCoder)aCoder
+{
+    [super encodeWithCoder:aCoder];
+
+    if (self === SharedUserDefaultsController)
+    {
+        [aCoder encodeBool:YES forKey:CPUserDefaultsControllerSharedKey];
+        return;
+    }
+
+    [CPException raise:CPUnsupportedMethodException reason:@"encoding of non-shared CPUserDefaultsController not implemented"];
+}
+
+@end
+
+
+@implementation _CPUserDefaultsControllerProxy : CPObject
+{
+    CPUserDefaultsController    _controller;
+    // TODO Could be optimised with a JS dict.
+    CPMutableDictionary         _cachedValues;
+}
+
+- (id)initWithController:(CPUserDefaultsController)aController
+{
+    if (self = [super init])
+    {
+        _controller = aController;
+        _cachedValues = [CPMutableDictionary dictionary];
+
+        [[CPNotificationCenter defaultCenter] addObserver:self selector:@selector(userDefaultsDidChange:) name:CPUserDefaultsDidChangeNotification object:[_controller defaults]];
+    }
+
+    return self;
+}
+
+- (void)dealloc
+{
+    // FIXME No dealloc in Cappuccino.
+    [[CPNotificationCenter defaultCenter] removeObserver:self];
+    [super dealloc];
+}
+
+- (id)valueForKey:(CPString)aKey
+{
+    var value = [_cachedValues objectForKey:aKey];
+    if (value === nil)
+    {
+        value = [[_controller defaults] objectForKey:aKey];
+        if (value === nil)
+            value = [[_controller initialValues] objectForKey:aKey];
+
+        if (value !== nil)
+            [_cachedValues setObject:value forKey:aKey];
+    }
+    return value;
+}
+
+- (void)setValue:(id)aValue forKey:(CPString)aKey
+{
+    [self willChangeValueForKey:aKey];
+    [_cachedValues setObject:aValue forKey:aKey];
+    if ([_controller appliesImmediately])
+        [[_controller defaults] setObject:aValue forKey:aKey];
+    [self didChangeValueForKey:aKey];
+}
+
+
+- (void)revert
+{
+    var keys = [_cachedValues allKeys],
+        keysCount = [keys count];
+
+    while(keysCount--)
+    {
+        var key = keys[keysCount];
+        [self willChangeValueForKey:key];
+        [_cachedValues removeObjectForKey:key];
+        [self didChangeValueForKey:key];
+    }
+}
+
+- (void)save
+{
+    var keys = [_cachedValues allKeys],
+        keysCount = [keys count];
+
+    while(keysCount--)
+    {
+        var key = keys[keysCount];
+        [[_controller defaults] setObject:[_cachedValues objectForKey:key] forKey:key];
+    }
+}
+
+- (void)revertToInitialValues
+{
+    var initial = [_controller initialValues],
+        keys = [_cachedValues allKeys],
+        keysCount = [keys count];
+
+    while(keysCount--)
+    {
+        var key = keys[keysCount];
+        [self willChangeValueForKey:key];
+
+        var initialValue = [initial objectForKey:key];
+        if (initialValue !== nil)
+            [_cachedValues setObject:initialValue forKey:key];
+        else
+            [_cachedValues removeObjectForKey:key];
+
+        [self didChangeValueForKey:key];
+
+    }
+}
+
+- (void)userDefaultsDidChange:(CPNotification)aNotification
+{
+    var defaults = [_controller defaults],
+        keys = [_cachedValues allKeys],
+        keysCount = [keys count];
+
+    while(keysCount--)
+    {
+        var key = keys[keysCount],
+            value = [_cachedValues objectForKey:key],
+            newValue = [defaults objectForKey:key];
+
+        if (![value isEqual:newValue])
+        {
+            [self willChangeValueForKey:key];
+            [_cachedValues setObject:newValue forKey:key];
+            [self didChangeValueForKey:key];
+        }
+    }
+}
+
+- (BOOL)hasUnappliedChanges
+{
+    var defaults = [_controller defaults],
+        keys = [_cachedValues allKeys],
+        keysCount = [keys count];
+
+    while(keysCount--)
+    {
+        var key = keys[keysCount],
+            value = [_cachedValues objectForKey:key],
+            newValue = [defaults objectForKey:key];
+
+        if (![value isEqual:newValue])
+            return YES;
+    }
+
+    return NO;
+}
+
+@end
+