GG addresses accusations that Google may be decreasing quality in order to sell more AdWords.
[Link to quote
"Maybe you'll just deny some of the conspiracies. We trust you if you say its not the case."
I deny the conspiracies. It's not the case. ;) Seriously though, Google got to be where it is partly because we try our best to return the best sites to our users. We haven't stopped that tradition, and I hope we never do. Any short-term revenue from purposefully hurting our quality would ultimately do more long-term harm to Google (and its users) instead. I can say with complete confidence from my experience here that Google takes the long-term view about maintaining its quality. When we see ways that we believe we can improve our quality, we test it out a lot and then introduce those changes.
I think most of the data for this iteration has been folded in now. After any change, some people are going to be happy and some people aren't. We take feedback seriously (that's why I mentioned writing to webmaster [at] google.com with specific comments using the keyword "floridaupdate" several times on this topic already), but it's a fact of life that only a few urls can be on the front page, and if one site replaces another then someone won't like the results and someone will.