bears5122 - 7:05 am on Feb 9, 2011 (gmt 0)
Adsense isn't the problem in terms of rankings. If there was a penalty for using Adsense, sites would just find an alternative revenue source.
If you want to take a shot at Adsense, it should be for Google having little to no editorial guidelines for being a part of the program. For a company that has heavily altered who is allowed to advertise in their search results, they've gone the opposite direction when it comes Adsense (despite the PR garbage they'll spew about how they ban bad accounts).