OK, we're on all at least one forum (and the BEST one in many aspects ) but I'm sure we'll all a part of several forums (SP, DP, WF, etc). Since forum marketing can be very profitable, I'm just wondering how much traffic or sales anyone gets from their sig?

I can't really say that I get much. None here - gotta create a sig first! But overall I think if you post a lot you can generate some good traffic. And on places like DP (DigitalPoint forums) people sell sigs all the time.