This unholy marriage of Microsoft technology and Nintendo software comes from Yankeyan, who probably just gave Shigeru Miyamoto an inspiration for the Wii's next exergaming title.
Yankeyan programmed this with OpenKinect drivers and Nintendo emulation, so that Kinect recognised his motions and virtual button presses onto the emulator. "I could have placed a simulated keypad right in front of me that I can press with my hands, but I thought full body gestures were more in the spirit of Kinect," he writes. "Of course, Mario isn't designed to be played like this, so this is really really hard."
Gamer Plays Super Mario Bros. On Kinect [Game Informer, thanks CajunRTard]