As everyone in this forum is probably aware, AdSense has long promoted putting ads directly above the main content
[google.com] and by including as many ads as possible on our pages.
In a recent wired.com interview, Matt Cutts (head of google's webspam team), mentioned that they asked human raters who were evaluating sites: "Does this site have excessive ads?"
The Google Search and Google AdSense teams operate completely independently, and that is probably a great thing... but the contradictory messages that we get from the two departments needs to be co-ordinated. They don't necessarily have to talk to eachother, but an executive up in the hierarchy needs to help develop some clear guidelines about this.