walkman - 9:52 am on Feb 25, 2011 (gmt 0)

That's bold. I wouldn't even consider doing that. Of course they don't target Adsense sites per se, but content farms. IMO Adsense has nothing to do with it.

My content is updated by hand, daily. I spend 3-4-5 hours each day at that, yet my site lost 50% of traffic. Maybe, just maybe, the adsense is one of the signals