The CSS Pointers Group  
   CSS Tips and Pointers
   http://www.css.nu/

css-discuss Mailing List  
   Practical discussions of CSS and its use. High volume list.
   http://www.css-discuss.org/

RichInStyle.com  
   Test cases and bug information, plus tutorials on CSS and HTML, by Matthew Brealey.
   http://richinstyle.com/

WebmasterWorld: CSS Forum  
   Discussions on layout, compatibility and trouble shooting.
   http://www.webmasterworld.com/forum83/

Style Sheets by Example  
   Gives an explanation about what CSS is, examples, and sample styles.
   http://www.jalfrezi.com/fstyles.htm

Web Developer's Virtual Library - Cascading Style Sheets  
   Teaches how to use CSS to improve the look and structure of HTML pages. Links discuss how to use CSS to avoid table layouts, colors, fonts, and layers.
   http://www.wdvl.com/Authoring/Style/Sheets/

Dive into Mark: CSS  
   Archive of postings to Mark Pilgrim's weblog.
   http://diveintomark.org/archives/rooms/css/

Code Style - CSS Style Guide  
   Includes a cross-platform font sampler, information on media stylesheets, FAQ, and a glossary.
   http://www.codestyle.org/css/

Eric Meyer - CSS  
   Articles, tutorials, discussion and resources for CSS.
   http://www.meyerweb.com/eric/css/

About.com - Cascading Style Sheets  
   Comprehensive guide to CSS and resources for style sheet authors.
   http://webdesign.about.com/cs/css/

EServer TC Library: Cascading Style Sheets  
   A collection of dozens of rated, reviewed online resources for developers who work with cascading style sheets in web and information design.
   http://tc.eserver.org/dir/CSS

Webmonkey - Stylesheets  
   Guides and articles written between 1997 and 1999.
   http://webmonkey.wired.com/webmonkey/authoring/stylesheets/

What's new in CSS2  
   Overview of the CSS2 technologies and the major changes from CSS1.
   http://www.aboutbabette.com/css2/index.html