AndyA - 11:58 am on Apr 29, 2010 (gmt 0)
I went back and checked my stats for the period January 1 - April 28, 2009 vs. January 1 - April 28, 2010.
1. Impressions are almost identical (traffic is up, but I've reduced AS impressions because of its poor performance).
2. Click throughs are down 50%.
Ad Sense is the ONLY advertiser on my site showing a decrease this year.
You tell me where the problem is. I'm pretty sure it's not my site, though.