This is an interesting concept for unlimited purely electric powered vehicle range by swapping the battery at battery exchange stations.  The stations would own the batteries, so the cost of electric powered vehicles would be less, and concern for the cost of replacing expensive batteries when their life is up is mitigated. Be sure to watch until 1:05 for a 3d animation of how it works.

Urban Aeronautics, founded by Dr. Rafi Yoeli, aims to develop a rotorless vertical takeoff and landing vehicle ideal for urban environments.  It’s expected to be available by 2010. [Gizmodo]