UK Designer Network  
A friendly networking community for designers. Relax, make friends or contacts and discuss issues relating to the marketplace, careers, design and technology.
Details www.ukdesignernetwork.com

Webmaster Community Forums  
Professional webmaster forums heavily focused on marketing and search engine optimization.
Details www.wm-community.com

Webmaster Serve  
Webmaster discussion forums exchange ideas with other webmasters.
Details www.webmasterserve.com

Webmaster Shed  
Provides webmasters in need of help with whatever information and/or tips they need to help them out!
Details www.webmastershed.com

ZarasGuide.com  
An online community for mobile users that like to stay upto date, and speak their mind. Users have access to a forum and wiki and actually generate the content on the site.
Details www.zarasguide.com