csscreator.com

Community of web developers and designers solving website style issues with CSS

css-tricks.com

An informative site all about css. It has an active forum, code snippets and more but the site is a bit block and hard to follow but the information is clear and easy.

forums.devshed.com

Welcome to devshed, a community dedicated to spreading the the spirit of open source to beginner and professionals alike.

A forums for programmers covering php, apache, mysql, jserv,  python, roxen, zend, zope, ftp, java, postgresql, linux ...

www.webmasterworld.com

This is a big site in the online world it is a massive forum with some paid only sections. It has SEO, SEM, Webmaster, news and other topics from around the world.