Microsoft Tag...

So this is mobile tagging with Microsoft Tag. You take a picture with your iPhone say. It decodes the symbols and takes you to a URL. This tag take you to this site.

Here's the blurb: 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!

Get it at http://gettag.mobi/.