This week Google updated it’s search algorithm to enable users to provide feedback that helps Google refine search results by potentially lowering the value of content farm and other crappy sites.

http://www.mediapost.com/publications/?fa=Articles.showArticle&art_aid=145733

My concern is that unscrupulous business people (the same ones who create the content farms and do keyword stuffing, etc.) will now flag genuine sites of their competitors to try to game Google into lowering legit sites.