I’m not really a “CSS person” but as a contract freelancer I have to get stuck in with everything sometimes!
This is just my personal list of CSS resources that I like to refer back to when I get stuck:
47 CSS Tips and Tricks – A really nice list of useful everyday tips
http://www.instantshift.com/2010/03/15/47-css-tips-tricks-to-take-your-site-to-the-next-level/
CSS Compatibility and Internet Explorer – What exactly IE does and doesn’t do!
http://msdn.microsoft.com/en-us/library/cc351024(VS.85).aspx#pseudoclasses
CSS Selectors – Handy reference for when you forget
http://css.flepstudio.org/en/css-properties/selector-css.html
CSS Positioning and the Box Model – Handy beginner reference
http://www.brainjar.com/css/positioning/
IE7 CSS3 Selectors – Works like a charm!
http://dean.edwards.name/IE7/compatibility/nth-child.html
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