I like the gang/team idea as well. It would have to be watched closely of course, or as Chojin said, it could work out in the opposite direction as it was intended. I also like the infractions idea would help, especially within the team idea. Perhaps the team leaders are also part of the group of members who could give infractions so that they could drop infractions on members of their team who are repeatedly acting in a manner unfit for someone on a team.
Personally, I wouldn't mind seeing a sports board added. Some of the best flames and smack I have ever seen come from sports discussion boards. There's something about sports (especially collegate sports) that brings out many peoples inner flaming troll (usually with entertaining results). Not sure how popular a sports board would be here though.
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