If the Kinect had been designed by Apple, it's safe to say the mainstream press would have dubbed it revolutionary. But, no, it's made by Microsoft, and simply goes down in history as the marvel that everyone loves, but doesn't get due respect.
In case you haven't played with one, it's a webcam-esque add-on for the Xbox 360 that allows you to control games and other media via motion and voice commands. It was released on November 4, 2010 and became the "fastest selling consumer electronics device" according to Guinness World Records.
In some ways, the Kinect is a direct competitor to the Wii motion controls and the Playstation Move, but differs in that no physical controller is required.