Not exactly online dating but what a great idea. Reminds me of the European company who ties a 10-digit number to an email account and provides bumper stickers, so you can send an SMS to the hottie in the car in front of you while stuck in traffic. They also created a line to clothing with the ID number on it, although it looked similar jail ID.
From TIME.com:
NuRide, an online-carpooling service, promises to make carpooling easier and more fun. The company, which launched its site last year from an office in Herndon, Va., offers commuters in the Washington area not just a Web-based directory of potential carpoolers but also a way to arrange a trip online. They’re also working on a more ambitious phone version of the service that would use global-positioning satellites to match riders with cars already on the road in their area.