While it's presented in the context of a workout or hiking route, you could use the app for just about anything, including drawing fun shapes on the map of your town, if you're so inclined. Along with the mapping, the app displays statistics in real time like elevation, distance traveled, speed, etc. My Tracks can also use Google Docs' little-known but very cool ability to receive the output of web forms in a spreadsheet, so you can track your routes and see your average speed over time.
It all gets demonstrated here by Jeff, the Google cyclist.
