Ok, I'll admit it--I'm a forum slut. Not a member at all of them, but I frequent a few quite regularly:
[H]ardForum
bit-tech
pheaton
wc101
anandtech
THG
http://kalnet.kalshadowtech.com/php/phpBB2/index.php (one my friend runs off his cable connection. If you're gonna visit it, don't do it all at once because you'll most surely crash it on his crappy cable connection).
I know at least some here frequent others (I've seen Boco's case at at least one.........nice case by the way).
So what other forums do you contribute to?