This video from Ted.com is a very interesting presentation given by Pattie Maes from MIT about a project being spearheaded by one of her students Pranav Mistry. The system is a wearable device that recognises what is in front of you (a person, a product, a newspaper) and can project meta data related to that person/item onto any nearby surface (including your hand). The downside with the current WIP technology is that everyone else around you needs to wear a plain white T-Shirt and everything needs a blank white space on it to project onto. Joking aside though there are some really cool applications shown in the video including the simple wrist watch projection and the photography/image sorting.