Traditional skateboards are so old news. The OneWheel electric skateboard rolls ahead with the idea that you don't need four wheels or a good sense of balance to ride.
The Onewheel board has batteries under one foot and control electronics under the other. The control electronics have motion sensors — like what you would find in your iPhone — which run a control loop which tells the motor how to run and balance. The whole thing is powered by a powerful hub motor, which is about a 2,000-watt peak motor or 500 watts of continuous power. It's all mounted on the type of wheel that would usually be used by a go kart.
Their Kickstarter had a $100,000 goal, but has surpassed that amount and ended with $630,862 pledged.