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.