We've known for a while that the new iPhone 3G would have the magic of GPS, but we didn't fully realize how that power might benefit car owners. While we've seen a few semi-cool, car-centric applications available for the device -- from mpg calculators to maintenance reminders -- this program could prove the most useful for the forgetful among us.

After parking your car at a crowded shopping mall, users of G-Park tell their iPhone where their car is. When they wrap up their shopping, the application will provide directions back to the car.