In as little as 60 seconds, GeoOrbital says they can add motorized power to just about any bicycle.
You just snap off your front wheel and replace it with GeoOrbital's electric wheel. The wheel uses a 500W motor and 36V battery to propel the bicycle up to 20 miles per hour. The battery — which is removable— will last at least 20 miles on its own, or about 50 miles if you mix in some pedaling.
The GeoOrbital wheel will eventually retail for about $900 — which is cheap by electric bike standards — and the company is offering it for as low as $500 to early backers on Kickstarter.