It's a personal helicopter, really two rotors on a hat. Action video here, from Makezine (thanks to Dave Proffer). As it happens, one of my upcoming New Year's resolutions is to get back into aviation actively. But avoiding this hat-helo would be consistent with two of my rules for a happy flying career: Don't fly anything that's not factory-built (sorry, home-crafters); and fly only airplanes, not helicopters. More on all of this another time.
This article available online at:
http://www.theatlantic.com/technology/archive/2009/12/gift-thoughts-for-the-holidays/31036/
