There are large number of affiliate networks and web site owners are not very sure as which one to go for. I have read a number of blog post and articles in ezines about affiliate marketing and the best networks. Many of them forewarn about joining affiliate networks without proper background checks. Now, if it is possible I am not able to figure it out. Affiliate networks might be circulating all information about themselves. The testimonials are rarely presented and there are few reviews about the services. Either the affiliates, who are making good money, do not want to share the information, being afraid that it might harm their own interests or there may not be anyone interested in doing it at all. May be super affiliates know a thing about it. But I have not found a single account that might help in making a decision.
Azoogle ads is worth looking into, however they asked me about paid traffic and I was declined because I don't provide paid traffic to my site.