When I began work on C2G, there were already 3 (or more) iPhone apps out there for using car2go. I've used two of them, and frankly they just weren't very good. The most popular one available has a cluttered interface (e.g. who needs satellite view on a map when you're looking for a car?), and a strange feature where, once you reserve a car, there's no way to see where it is from within the app. Anyway, I don't want to talk a bunch of trash; the point is that it was pretty straightforward to make an app that better serves the basic needs of a car2go user. I hope C2G is exactly that.
See some screenshots on C2G's App Store page.
Coffeeshopped