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AdSonar are big cheaters... They will bann you if you don't have 100% US traffic...
This is unsubstantiated rubbish.
AdSonar does not have as high an eCPM as Google Adsense, but it's reasonable. It may be better or worse than the eCPM on YPN.
I have been using AdSonar as an Adsense alternative but I'm looking around for replacements.
On which note there are more contextual ad services crawling out of the woodwork by the day. I have had two new companies approach me in the last month.
As to whether there's "anything better" than AdSense at present, Thirdcatgy - the answer is no, I very much doubt it.