Photoshop Exchange - Brushes, Gradients, Patterns, Styles, Shapes, Actions
http://www.adobe.com/cfusion/exchange/index.cfm?event=productHome&exc=16
Din Pattern
http://www.dinpattern.com/
Change URL and keep browser history on AJAX
http://ajaxpatterns.org/archive/Unique_URLs.php
User Interface Design Pattern Library
http://ui-patterns.com/
Squidfingers / Patterns
http://www.squidfingers.com/patterns/6/