http://www.somethingawful.com http://www.fazed.com http://www.fark.com http://www.bressler.org http://www.madville.com http://www.cloud10.org (NSFW) http://www.dslreports.com http://www.b3ta.com http://www.infernalbridegroom.com have fun, join a few!
http://www.physicsforums.com/ I read the Philosophy, Astronomy and Psuedo Science Forums at this site.
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Hmm, I never even realized Gamefaqs had its own board. I'm a little wary of VG boards, though. Usually the (very) young crowd turns them sour.
I'm not a member of their boards, but I like to check them out. There are usually a lot of good posts for whatever game you want or anything else. But, like you hinted at, there are some people that will make new threads without looking down to find a thread that has the exact same thing they post about. Hmm...sounds familar.