Probably been brought up before, but why don't we introduce some sort of invite system? The amount of useless individuals who post around here - most of them just trying to get their post count up.
I know dribbble works off the same principle, could increase the quality of discussion around here. I know you'd argue that it might decrease the amount of activity, but surely you want quality over quantity? Otherwise what is the point?
Say each member gets 4 invites, or an unlimited amount, it really doesn't matter. Might give people a little more pride being a part of this community.
Just a thought.