1) CPAAffiliates.com

2) Ablakeforum.com (much broader than just affiliates)

3) Warriorforum.com (much broader than just affiliates)

4) Abestweb.com

5) Affiliate-marketing-forums.5staraffiliateprograms.com

6) Wickedfire.com

7) Affiliatefix.com

8) Twistforum.com