Small but active is tough. Everyone seems to flock to the likes of IGN or GameFAQs/Gamespot... and then troll the life out of everything. The smallest communities I can think of that haven't just disappeared into nothingness are the forums based on achievement hunting, xbox360achievements.org and achieve360points.com, but of course they're kinda centered around the one topic. You might be able to get a discussion going over at gamersyde.com, but most of those take place on the individual articles rather than their forums.
