If you liked the idea of the Car2go service we profiled a few weeks back, Smart fortwos available for rent by the minute with and some pretty fancy tracking apps to help you find them, but maybe you wanted to drive something a little bit bigger, BMW has you covered. Well, assuming "you" are German or at least living in Germany. The company has launched its own car sharing service it calls DriveNow. This one is billed as a "premium" -- though curiously none of the c