martinibuster - 7:30 am on May 7, 2010 (gmt 0)
I am seeing an increase in interest based ads lately. As I mentioned above, I actually clicked on an ad, which may be the first time I ever did that. Someone outside the search industry mentioned having noticed their their browsing behavior reflected in the ads they saw and that it was a bit creepy.
My CTR doesn't seem to have been affected. But I'm not doubting that others are having a different experience.