We recently covered a comment from Googler JohnMu on if click data is used in Google for ranking purposes. Of course, John gave the typical Google response.
But now we have a comment from Matt Cutts of Google at a Sphinn thread, where it appears that Matt has completely denied the rumors that Google may be using click data (aka bounce rate) to rank web pages.
Without reading the article, I'll just say that bounce rates would be not only spammable but noisy. A search industry person recently sent me some questions about how bounce rate is done at Google and I was like "Dude, I have no idea about any things like bounce rate. Why don't you talk to this nice Google Analytics evangelist who knows about things like bounce rate?" I just don't even run into people talking about this in my day-to-day life.
So this seems to me that Google seems not to take into account people clicking from Google's search results to a web page and then clicking on the back button. This is the strongest statement on the topic I have seen from a Googler to this date.
I also recommend checking out HuoMah.com and see his analysis about all of this.
Forum discussion at Sphinn.