These Siftables from MIT Media Labs are small Post It-sized displays with processing power built in, allowing it to communicate with other Siftables as well as detect motion and proximity. You'll have to see what that means in the video, as they have different examples of shaking these Siftables, connecting them together, and having each respond accordingly to the one next to it. In its current form it's just a neat toy that doesn't really do much, but if you can adapt this to say, cellphones or MP3 players—stuff people actually carry around with them every day—it might make for some neat interactivity when you and your friends meet up and make your iPhones kiss. [MIT via OhGizmo]