fringedgentian - 7:27 pm on Apr 14, 2011 (gmt 0)
Good point. My site also significantly gained (~20%) and has a LOT of advertising, although it isn't through Google. Some pages have as many as 15 graphic advertisements or more, though I would say 6 on average.
I believe there are so many different advertising and affiliate networks that Google can't really tell the difference between what is an isn't an advertiser.