Click on the links below for some very good resource sites, all will open up in new windows.
http://www.peachpit.com/guides/guide.aspx?g=webdesign
http://www.webreference.com/
http://www.alvit.de/handbook/
http://www.alistapart.com/
http://www.w3.org/Style/CSS/
http://www.csszengarden.com/
http://meyerweb.com/eric/css/
