DriveNow

In case you haven't heard: car sharing is big business. Broadly speaking, there are two kinds of car-sharing companies. Zipcar -- America's pioneer in the sector -- represents one type, which is similar to a traditional rental car business, except it operates on a membership model. Renters pay annual dues, which give them access to the company's fleet of vehicles that can be rented by the hour on very short notice and with very little hassle. The other kind of car-sharing company has been made possible by smartphones and allows individual car owners to loan their vehicles to car-less...