Many publishers have found large fluctuations in their AdSense revenue and have wondered what is causing it and if there was anything that could be done about it.
Google has put some information together in two parts that they say should be helpful.
Yes, I read a different article about how Google is using their ad space a little more conservatively. I am seeing a bit of a drop in revenue, but am hopeful it wll all work itself out in the long run. Apparently these changes are to go hand-in-hand with changes in AdSense, according to the article i read.