Google's new +1 (a.k.a. Plus One) social button came out a few hours ago. I spent these past hours adding the +1 button to my plugin, WP Buttons. It can be downloaded from the WordPress directory here: http://wordpress.org/extend/plugins/wp-buttons/
In addition to the +1 button, I added a bunch of other cool features to WP Buttons. The coolest one in my opinion, is displaying the buttons after everything else is loaded. Download the latest version and try it out!
Here's a description of the +1 button, directly from Google:
The +1 button is shorthand for "this is pretty cool" or "you should check this out."
Click +1 to publicly give something your stamp of approval. Your +1's can help friends, contacts, and others on the web find the best stuff when they search.
Tell me what you think! Since this is a new feature, feedback is very important! :)