Just read an article on Austin CarShare. I think it’s a great idea.
For a monthly membership fee, you can reserve a car parked at various spots around town. You unlock it with a special key fob and go. When you’re done, you just return it to the same place.
I'm looking forward to giving up my car when I move to New York, but it's reassuring to know zipcars offers the same service if I go through withdrawal.