Mobility on Demand (MoD) systems are fleets of lightweight electric vehicles at strategically distributed electrical charging stations throughout a city. MoD systems solve the "first and last mile" problem of public transit, providing mobility between transit station and home/workplace. Users swipe a membership card at the MoD station and drive a vehicle to any other station (one-way rental). The Velib' system of 20,000+ shared bicycles in Paris is the largest and most popular one-way rental system in the world. MoD systems incorporate intelligent fleet management through sensor networks, pattern recognition, and dynamic pricing, and the benefits of Smart Grid technologies include intelligent electrical charging (including rapid charging), vehicle-to-grid (V2G), and surplus energy storage for renewable power generation and peak sharing for the local utility. We have designed three MoD vehicles: CityCar, RoboScooter, and GreenWheel bicycle. (Continuing the vision of William J. Mitchell.)