Music:

English Pop http://www.epop-music.com/forums.html
Jpop http://www.jpopmusic.us/forums.html

Cpop http://www.cpopmusic.co.uk/community/index.php
Kpop http://www.kpopmusic.co.uk/community/index.php
Tenzaii http://www.tenzaii.com/community/index.php (CPop, KPop, JPop)

Vpop http://www.vpopmusic.co.uk/component/option,com_smf/Itemid,29/
Pinoy Pop http://www.pinoypop.co.uk/component/option,com_smf/Itemid,26/
Thai Pop http://www.tpopmusic.com/component/option,com_smf/Itemid,26/

Other:

Learn Korean http://www.learn-korean.net/forums.html
Web Design http://www.help4web.co.uk/forums.html

As usually this isn't the final list, we will fix and update the list when necessary...