Joomla Forums

http://forum.joomla.org

http://www.mambers.com

Rockettheme template club forum/

http://www.joomlaya.com/forums/

http://www.joomlashack.com/

Mosets Forums

Web Development and Hosting

http://www.webhostingtalk.com

http://www.sitepoint.com/

http://forums.site5.com/

http://forums.digitalpoint.com

http://www.daniweb.com/ 

Real Estate

http://www.reiclub.com/forums/