At CES Microsoft introduced Microsoft Tag, a system that enables users to instantly access mobile content,, videos, music, contact information, maps, social networks, promotions, etc. simply by pointing the device’s camera to a custom tag.
If this makes you think of QR codes, you’re not the only one.
Like QR codes, Microsoft Tags are unique two-dimensial codes that can be used to open URLs or multimedia files. The big difference is the technology behind it.
Tags doesn’t actually store any information, except for a unique ID which can fetch more data stored on Microsoft servers. That’s how they allow more information to be “attached”.
They’ve already launched an iPhone app and a most other handsets have a mobile reader.
There’s loads more info over at http://www.microsoft.com/tag/