This list, CSS – Contents and compatibility, from QuirksMode will be referenced more and more as IE6 and IE7 fade away.
Pattern Stuffs
Components, Patterns, and Frameworks! Oh My!, Flex UX, Pattern tap, UI Patterns, Search Patterns, Design Patterns, from colleague Suman Paul
How do you answer the Internet Explorer 6 question? Universal Internet Explorer 6 CSS on Google code.
From For A Beautiful Web.
“I want to share an additional set of principles and patterns I have been using for RIA design. By Theresa Neil
Mobile Design & Development Workshop Assets
A bunch of resources for mobile design & development.
Litmus
The advanced testing tool for web professionals.
Basically, it will show you screenshots of your site in different browsers.
HTML5 and Class naming references.
Fluid Images for a fluid layout, and works in IE. With the help of AlphaImageLoader and some Javascript. Unstoppable Robot Ninja