If you are looking to promote and affiliate offer via your forum it's more important to find an offer/offers that works with the niche of your forum.  Don't try to sell mortgages on a music forum, or promote zwinky on a webmaster forum.

Azoogle has a broad spectrum of offers and might be a good place for you to start.
Firelead has amazing customer service and usually has a higher CPA than Azoogle, though not nearly as many offers.
RocketProfit is ok.  They usually offer a high CPA but the tech side of their company is in a different country than the sales side which has lead to a lot of frustration for me in the past.

I have been using them for about 3 months... and my TOTAL earnings? let's just say can't even buy me a decent dinner
same thing with amazon... I guess I must be doing something wrong coz I have read some people really making money thru cj and amazon..

but I would rather stick with ppc ads... it's easier for users to CLICK than to BUY..

As we know CJ and CB deals in e-books or e-stuff so this is a difficult job to earn some money from them. People can get a lot of e-stuff in free so it is worthless for me to have them as my affiliate program.