I recently was comparing my G1 apps to my bosses iphone apps and the one thing I really liked was an app that brings up your map and shows you gas stations in the area and it displays the prices for each different gas station. It apparently works by allowing anyone with the program to enter what prices they see around town. So if I pulled into a gas station and regular was 2.50$ a gallon, I could enter that info and everybody else would see the change I made.
I hope that makes sense to everyone.
This app would be very helpful to me and many others!