I'd be interested in this too.
Actually, I think you should ask potential users to list their favorite movies; if Rambo or Red Dawn are on the list, ban 'em immediately. <img src="/images/graemlins/wink.gif" alt="" />
One other idea, you could set up the forum so that users must have some minimum number of posts elsewhere on the board to participate in it.
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"When I read about the evils of drinking, I gave up reading." Henny Youngman