We've seen a few competitors out there that are really big. Glympse (http://glympse.com/) I think is the biggest one and we tested out their app and weren't impressed with their mobile to mobile experience. If one person is on a computer the other on their phone their app is amazing but if you don't have flash all they do is show a picture of a blurry map to show the other person's location.
Do you know of other competitors out there?