What industry are you looking for, and what are you expecting to pay? You can use Google AdWords for CPM ad delivery if you wish.
Maybe he got banned from them? I know I did. xD (Did stupid things way back when I started looking into internet stuff, regret it)
Hey GreatestSwordsman, is important knowing, what you mean with "Good CPM network". You mean fast payments ? Or good CPM ? Or good support or... or... or all together? So, if you want good answers, we need know from which countries is you traffic. Is your site adult or no ? Tell us more info.