Google introduced its new service called Google Latitude. This is a more of a mobile device service. You can visit http://google.com/latitude and share your location with your friends. With Google Latitude you can easily see where your friends are right now, you can contact them via SMS, IM or Phone call.
If you are on the move and you have a laptop with any GPRS or 3G device, then with the help of this software you can find your exact location anywhere in the world.