CSS Help
Even with the best references (like this book), sometimes you need to ask an expert. You can join a discussion list where CSS-heads answer questions by email, or peruse a wealth of information in an online forum.
Email List
CSS-Discuss: http://css-discuss.org/. The longest living mailing list dedicated to just CSS. You'll find CSS masters willing to help get you out of your CSS troubles.
Note
Before pestering the CSS-Discuss list with a question that 47,000 people have previously asked, check out their wiki—a collaborative Web site where group members freely add, edit, and update each other's articles. This wiki has evolved into a terrifically convenient index of tips and tricks, best practices, and in-depth treatment of CSS topics. Visit http://css-discuss.incutio.com/.
Discussion Boards
CSSCreator Forum: http://www.csscreator.com/css-forum/ . A very active online forum offering help and advice for everything from basic CSS to advanced layout.
SitePoint.com's CSS Forum: http://www.sitepoint.com/forums/forumdisplay.php?f=53. Another helpful group of CSS addicts.