Thats a good idea -- I also look at that.

One of the other things that I do is go to the site and see exactly what type of ads are already being displayed.

For instance with AVN Ad/Adbrite ads I've noticed that sometimes the conversion ratios that they have listed in the stats are underperforming because the ads don't stand a chance for the most part of getting any real good response.

E.G. there's tons of good gay sites on those networks with str8 porn ads, casino ads, and god knows what else...