I found an article here: http://searchenginewatch.com/article/2080631/Google-Quietly-Launches-Panda-Update-Version-2.2 Appears to be an "algorithm aimed at reducing rankings for "low-quality sites."
basically they are now weeding out redundant and "copied" content websites and kicking them down the search results pages. The more bounces you have on your site, the worse it does for that keyword.