There are reports in the past 24 hours that icons are beginning to appear in Adsense ads. The Hybrid Car Forums are one example as can be seen from the following screen capture of their ads.
It looks like this might be a new feature they are testing. I suspect that the theory is that icons will draw readers eyes to the ad and bring higher CTR.
Update: Jensense notes that the icons are the advertisers favicons and points to this discussion over at webmaster world.
