[logo80]

I'm a forum slut. I just mention some...
Korg related
http://www.korgforums.com/forum/phpBB2/

MOTU
http://www.unicornation.com/phpBB2/index.php

Yamaha Motif
http://www.motifator.com/forums/index.php?Cat=1,2,4

Synth in general
http://www.progsounds.com/forum/

and last but not least...
eh eh eh mine one (ok, sorry for this sort of selfpromotion!)
http://www.dedicatedtotriton.net/cgi-bin/Forum/YaBB.pl

Regards, Lorenzo