Google has been working on a new +1 button for search results. They recently began rolling this out in search results and ads on Google.com. If it works out I assume it will be added to other country specific Google sites as well.
It is kind of early to tell how this will work out or what kind of benefits this new +1 button can really provide.
The first thing that comes to mind is that Google might be using this to personalize or target ads.
The second thing is if there is some kind of reward for hitting the +1 button then people are going to manipulate and take advantage of it.
I am sure Google is aware that people will try to get people to hit the +1 button for their web site and links.
It is way too early to tell what this new feature is all about or does completely yet.
I am leaning towards targeting ads based on recommendations or +1.
Google has been making a lot of changes, updates, and adding new features lately.
If interested in learning more about this new Google +1 button you can check the following at Google's Blog here:
This week in search 4/1/11
+1’s: the right recommendations right when you want them—in your search results
And here are a couple sample screen shots from Google with the +1 button: