There's a new niche emerging for car sharers like Zipcar and peer-to-peer entities: ride sharing. The way ride sharing works is that a car owner, perhaps for additional income, offers a ridealong to those willing to pay. Those interested can schedule a ride share through their smart phone. The renter signs up for the service, chooses a nearby car going their way and hops in. It's hitchhiking meets taxis for the smartphone era.