When I checked in to work this morning as I usually do I was surprised to discover a new Leaderboard feature had been introduced with the latest update of Google Maps with Navigation for Android. With each Google Latitude check-in you make, you earn points which are tallied to give you a total score for the week. Your score is then compared to others in your Google+ circles. The person with the most points leads the leaderboard. It would seem most of my friends on Google+ don’t check in too often! Early reporting on the ninja release are likening it to Foursquare, which I suppose in some ways it is (points and leaders). Of course Foursquare has a much more sophisticated incentive structure…