First shown at WWDC, the free app can extend reservations, browse available models, and find your car—on a map, or by honking the horn remotely. It's a polished effort, but you still can't forget your Zipcard. Here's why:
The RFID-equipped member card is still needed for the ignition system, and to unlock the car at the start of a session. That's a bit of a let down, but I guess it does make sense. Once that first step is out of the way, that's when you can use the iPhone to lock/unlock the car remotely.
Zipcar says it's working to add a visual snapshot of car availability (like you get on the Website), greater flexibility in reservation changes, and more detailed instructions to your parking spot.
If you have an iPhone (or iPod touch) and use Zipcar, this should probably be a no-brainer to test out. If you do, let us know how you go. [Zipcar (iTunes Link) | Zipcar]