BillyS - 11:49 pm on Mar 3, 2011 (gmt 0)
Don't forget that the search team and AdSense team are at odds with each other most of the time, probably diametrically opposed in philosophy of what constitutes a "good site".
Go out to the website themadscientist found and look at some of the sites that were penalized. The ones I looked at were maxed out on Adsense AND they had other ad networks on there too. It was often difficult to find the information among all of the ads.