Google is adding +1 to search results..

http://googleblog.blogspot.com/2011/03/1s-right-recommendations-right-when-you.html

To me this sounds like it will be really easy to manipulate. People that are actually surfing aren't going to take the time to rate a search result. Who will be able to rate it are people that are paid to do it....

More - http://blog.searchenginewatch.com/110401-070000

Speed labs - http://searchengineland.com/google-launches-page-speed-analyzer-in-labs-71027

Negative keyword lists - http://searchenginewatch.com/3642092

Enjoy your weekend.