They really should give us a option to turn it on or off. The few channels I run adsense on still have watched ctr implode over the last few months. Granted these channels are only throwing out 100 cpms a day it still is easy to see that ever since the intro and ramping up of this stuff it has had a horrible impact on ctr and thus earnings.
At least give us the option to turn it OFF google. I dont want to see car insurance ads on my tech site just because I was looking at car insurance 8 hrs ago.