This is Nissan's prototype for a personal mobility device. Just step on to the footpads and lean in the direction that you want to go:
The device has two foot boards, both of which are balanced on two wheels. The device’s tilt sensors detect when you shift your weight to turn, traveling at a maximum rate of about 5kph. The foot boards have handle bars attached to help you maintain balance, and can be connected in a variety of positions or separated.
When separated, the device only moves forwards and backwards. To turn, you simply lift and turn your leg as if you were wearing stilts. The overall effect is one of ski-less skis.
Link via DVICE