When I first came online I used to frequent the ITV Formula One forum, which was eventually taken down when ITV realised all anyone went there for was to complain that ITV's coverage of Formula One was crap and that the BBC should get it.
I also used to go to a wrestling forum but didn't last there long because I kind of lost interest in wrestling when WCW & ECW went out of business.
I'm a member of 2 Doctor Who forums but I never post in them. I'm only really there because a lot of TV writers & authors post there and I find the stuff they say of interest. I couldn't stand the thought of having to interact with elitist anal sci-fi fans.
This is the only music forum I've been a member of, before that I used to use a music chat room, I was there about 5 years altogether I lost interest when our group of regulars drifted apart (Including you know who
)