nomis5 - 6:13 pm on Nov 2, 2011 (gmt 0)
My main site is roughly 20% down for Adsense earnings compared to October 2010. Page impressions are roughly 15% up.
Overall earnings for that site are up though, because of additional earnings from Vibrant media.
Minor sites are up 85% earnings wise in Adsense but that's set against an increase of 260% in page views.
It's an uphill battle.