i've just put some on my site, http://ilumu.com , i like the way they have images but i think they would pay lower than using adsense
I have found that on game site such as flash games, as long as they are placed right they get a very high CTR though. And with adengage, after you start getting good CTR people will start paying by the week such as $20 a spot for 1 week and you can fill up to 16 rotating spots. so if you get enough traffic and clicks you can start doing a few hundred a week through them.
i'm getting an avg of 0,037$/click on adengage even yesterday i've got paid, and they don't steal clicks like a lot of other networks, i like them, untill' now it's the best cpc i ever had on my site
forogt to ad, i think they cheat you too because some of the clicks aren't paid for, even when people buy ad spots