A “Like” button from Google! - The “Google +1 Button”

Google has unveiled their spick-and-span feature to be, the Google +1 Button a "tour guide" who will help people to discover more relevant content that is recommended by their friends and contacts.

So in near future, having a Google +1 button on your web pages will let users recommend your web content, so that their friends and contacts also see these recommendations when they do a google search in similar context.