Got an email today .. I bet others did to, and I like this part of the text. Google News Search So how much did you think you contribute by using AdSense on your site? Also note that Google's total revenue is 48% generated by the AdSense program. That's a big chunck. Imagine if we all stopped using it at once. People Power! Not that I'd want to, or if everyone would cooperate with each other. Just FYI.
I just don't understand what takes Yahoo and MSN so long to offer competitive and alternative ad network to adsense. It's a billion dollar question.