DP forum is not a scam you know. I have been there for months and earning more than $1,000 from various clients. So far, I'm also involved in other forums listed here.
I personally only sign up for forums with an active marketplace..
what about webmasterworld.com
If forums for community/forum administrators count, then don't forget: AdminAddict - Resources for Forum Administrators.
I'm on all these forums:
Coastercraze (28 December, 2009)