With unlocked GSM Centro smartphones now available, Google Maps for mobile with My Location will be available free for Centros, starting tomorrow. Free is a great price!
The app, which can be downloaded beginning tomorrow from Google's website, provides faster access to local maps, along with street-bound driving directions. My Location is specially built for the lost. You'll be available to press the "0" key to find out where you are, even if your Centro doesn't have a GPS system connected.
With position accuracy of approximately 1000 meters (a little over half a mile), the application comes close enough for many purposes - like finding a restaurant while you're traveling. GPS gets you much closer, but costs considerably more than free. There's a neat explanatory video on this page, which also includes instructions on how to get the applications.
