Gavin Jacke is a Director of Engineering for Microsoft Research. One of his inventions is the High Capacity Color Barcode. Microsoft's applied this technology to a new Windows Mobile product called "Tag." In short a Tag is a color barcode that you can place on a product or in an ad, and some one with the client application on their phone can aim it at your tag to get referred to a website with more information, receive a vCard, or be connected to a phone number. Pretty cool!