Stamkey stamps transfer personal info to your cellphone via Engadget
Yet another idea whose time has come. People are so focused on producing techniques for outputing data that humans can read (from a computer) and then reading that back in. But there's no reason to let a human read it! I've known about these two-dimensional barcodes for quite a while, and I love them. So dense with information, as well as having checks built in so even blurry images can be read. Everyone focuses so hard on getting optical character recognition levels up, but it's stuff like this which will be the real revolution in passing information from the cyberworld to the meatsphere and back.