At the Google I/O event yesterday, Danny Sullivan captured a preview of the Google +1 Button.
He wrote about it and posted several screen shots at Search Engine Land.
In short, he showed the implementation screens for publishers to generate the button and pick the button layout and size. He also showed several screen shots of how the +1 button is directly integrated into Google Analytics - which is the cool part.
Here are two of the many screen shots Danny shared - to see them all, go to Search Engine Land.
Forum discussion at WebmasterWorld.