Sent to you by Chris Hunter via Google Reader:
Android: If you have a bad tendency to forget where you parked your car in a huge lot, or forget where you parked in an airport lot before your week-long vacation Park Me Right is an Android app that can help you get back to your vehicle.
Park Me Right is simple: once you've parked your car, fire up the app and tell it you're parked. It'll mark your GPS location on a Google Map and save it so you can retrieve it later. You can use coarse or fine GPS to do it, but the latter is more accurate. When you get back and need to find your car, tap the "FInd Car" button, and the app will show you, a compass, and your car on the same map so you can find it again. If you prefer, you can use an augmented reality view, so you can hold up your phone and see which direction your car is and how far you have until you reach it.
The app is free, and even has its own tool to help you find parking spaces built-in, but I found it a bit spotty when I tested it. The real utility here is the ability to find your car quickly when you're jet lagged from a 5 hour flight, or you're tired after a day of walking around. Combine this with snapping a photo of your spot before you walk away, you'll never lose your car again.