koan - 2:14 am on May 2, 2011 (gmt 0)
AdSense revenues have been steadily dropping for years.
I am at a point where I would switch to any other decent contextual PPC alternative at the drop of a hat. Doing 1/3 of what I was doing in November 2010, after 5-6 years of steady growth. But there are none that I know of.