Focus Design’s “SBU v2.0″ self balancing electric unicycle. I think I’ve seen this in the Jetsons. It’s like half a Segway with twice the cool.
The specs: 1000 watt hub motor is larger than on any ebike I’ve heard of (the Optibike has an 800W motor); gyros keep you stable and upright; 10 mph top speed ; about 12 mile range from a LiFePO4 lithium-ion phosphate 38.4 volt 5AH battery. $1500 and made in Washington state.