It seems that Google AdSense is doing a fantastic job at some large sites, and a so-so job at others:
AdSense currently running on WebAdvantage
Local-Hotel.com
Discussions about putting AdSense on sites and the results:
iHelpYouServices Discussion
SitePointForums
Make Some AdSense
Article and Feedback form from WebAdvantage
Hey friends, Thank you !
Thank you, friends, for your sharing your ideas