Shouldn't be overly difficult... i haven't had a chance to play with it so i don't know all of the details of the program itself... but what would be nice is a simple extension to GoogleMaps that would allow you to "DropPin" like you can in the desktop or web based version of their applications, then Label and Save those pins.

It would be REALLY nice, if after you'd dropped those pins, you could access them later from another program.

This would serve very useful for programs that could do different things automatically when someone entered a specific store or area.

Maybe VPN-based clients/services that launch automatically when you get to work... or other things similar to that affect.