In search results, Google wants to "level the playing field" regarding "all those people doing, for lack of a better word, over optimization or overly SEO--versus those making great content and great sites," Schwartz quotes Cutts as saying, in a rough transcription.
Google Engineer Matt Cutts explains the following: “We are trying to make GoogleBot smarter, make our relevance better, and we are also looking for those who abuse it, like too many keywords on a page, or exchange way too many links or go well beyond what you normally expect.”