SitePoint Reference is an online guide with a wealth of information on web design. Divided into three sections, HTML, CSS, and JavaScript, it is a great place to find that bit of information you need while designing or editing a web site. Keep it in your bookmarks.
You might recognize SitePoint from their book publishing, including the recent Everything You Know About CSS Is Wrong! which details the use of CSS tables in web design. The title is hyperbole, in my opinion, but the book itself is excellent. It has changed how I view the design of web pages, and I hope to put it into practice in the near future.
found via the SitePoint blog
