I'm just getting back and I'm behind. I was googling to find an article about social network policies, specifically friending policies. I noticed that Google added a new feature where you can comment on a search engine result and like DIGG either promote it or demote it. You can customize the search results page too.
The YouTube Video describes the feature and the official blog post will tell you how it works.
As LockerGnome's Matt Hartley notes, "it will shake up search to the core for everyone." About a year or so ago, I blogged a bit about the concept of social search looks like this is the next frontier.