Car-sharing service Zipcar has offered an[itunes link=”http://itunes.apple.com/us/app/zipcar/id329384702?mt=8&uo=4″ title=”zipcar” text=” iPhone app”] for ages which lets customers sign up to rent a car by the hour from their phone, manage their reservations, and even unlock the doors of your reserved car when you get close enough. Now the company has finally gotten around to launching an […]