For sites which have implemented AdSense, Google now has complete information on what kind of activity a user does on a site. - Do the users stay around more, - the number of pages/visitor, - do the users return back to the site (repeat users) - how much do users click around (click-through rate) - etc
Do you think Google will ever use this data as a part of their algorithm to rank sites. After all, a surfer is the best source to reflect the quality of a site. If Google does integrate or use this data, how do you guys speculate different factors would affect a site's ranking. If you would be Google (assume), would you use this data, and if yes, how?
At least in their documentation, they have explicitly and unequivocally stated that participation in AdSense will not in any way affect a site's rankings.
You can either believe them or not, or perhaps suspect that they could change their terms... but at least at present, I think it's a strong bet that they're going to maintain 'independence' in this realm.