I was surprised to do a search on Google today and see an arrow and X next to each result. Mousing over the arrow showed the link title Promote. Mousing over the X showed the link title remove. See below.
Upon clicking on the up arrow, I got the following pop-up window:
After I clicked continue, the arrow was then shown green.
Update: Apparently, Google is calling this searchWiki. Here is there official post on the subject including an introductory video. Read why this is going to be a huge evolution to search engine results.