Hmm, putting the newbies in their own forum MIGHT work, however, a slightly more elitist idea might be to create another forum that's for regulars only.
Newbies would then have something to aim for, clean up their attitude and try to be a bit funnier in order to be accepted and allowed into the "Executive Washroom" as it were.
Although, I don't know how often we'd use it, unless we were wanting a discussion/competition that wasn't going to be ruined by trolls.