Actually Jeff, check out http://www.quickchat.org/ and you can get a nice chat room. I have seen many chat rooms like this and they are very controled! I was totally suprised and i think the reason is their is no person acting as a boss. (People actually chat bad because they want to get in trouble). I believe you can always try it, and if it doesn't work, ditch the idea. You never know.
Also, you could have featured chat sessions sponsored by someone or whatever like once a month.
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