SERIOUSLY, LOOK AT THIS POST
EDIT: Maybe I should edit this, so it won’t go unnoticed. This is really a huge step forward in what is considered to be ubiquitous computing. All the things around us are turned into interfaces, check the videos below to see what I mean. Although wearing a necklace that does this is, hmm, let’s say ridiculous, it will certainly trigger the minds of us interaction designers to explore the possibilities this has/will have.
Ubiquitous is here and it’s cheap. Touchscreens? Forget about it! Gesture-based interactive wave-your-hand-in-thin-air readers? Expensive! MIT guys have created somekind of necklace (or something) that has projector, camera and a mirror for under $300, that allows it’s wearer to handle ANY surface as a touchscreen device. You can even snap photos. TED will soon release a video of it, but here is some information on it already. The word on the street (the internet, actually) is that Jeff Han and Microsoft Surface are old news now.
Oh, Wired had some videos.