Google has real-time data for public transit in lots of cities. http://maps.google.com/help/maps/mapcontent/transit/live-updates.html http://maps.google.com/hel

Google has real-time data for public transit in lots of cities. http://maps.google.com/help/maps/mapcontent/transit/live-updates.html http://maps.google.com/help/maps/mapcontent/transit/live-upd...