azn_romeo_4u - 3:28 pm on Oct 21, 2011 (gmt 0)
I use to review a bunch of adnetworks. I think one time I joined like 50 of them for a review site I had. I was giving the networks, 50k impressions a day for the review that lasted 1-5 days. Here's what I know.
#3 Valueclick Media
#5 Yahoo Publisher Network (when it was alive)
The rest are pretty much garbage. There are a few other good one's but most don't compete with the one's above IMO base on my own tests. Other people probably had better results.