Microsoft Tag

Microsoft Tag creates unlimited possibilities for making interactive communications an instant, entertaining part of life. They tranform physical media (print advertising, billboards,product packages, information signs, in-store merchandising, or even video images)—into live links for accessing information and entertainment online.

With the Microsoft Tag application, just aim your camera phone at a Tag and instantly access mobile content, videos, music, contact information, maps, social networks, promotions, and more. Nothing to type, no browsers to launch!

The above tag is one I created quickly through Microsoft's tag manager.

Link:
http://www.microsoft.com/tag