The smart folks over at MIT are developing a short range car for rental in urban areas. The car is being sponsored by GM in the hopes to reduce pollution and congestion.
The wheels also enable incredible maneuverability. Instead of making U-turns, the car can spin on the spot, and when the driver turns each wheel 90 degrees, the car can parallel-park by moving sideways
Details on the range and power of the vehicles are still not available, but expect to see more of this sort of thing in the near future. For now you can offset your automobile carbon emissions and get directions using public transportation only.