Here are 5 excellent CSS Links:
1) Beginner’s Guide from a seasoned CSS designer http://www.cameronmoll.com/archives/001211.html
2) Web Developer’s Handbook http://alvit.de/handbook/
3) CSS3 Preview http://www.css3.info/preview
4) 10 common CSS mistakes http://www.designdetector.com/2006/06/ten-common-css-mistakes.php
5) Yahoo Grids CSS http://developer.yahoo.com/yui/grids/