This is Just Cool. Why didn't I hear about this before? Wired reports in "GPS Monopoly: Collect Over $200." From the article: "Players start out buying properties and placing apartments and hotels on them, much like the classic game. The twist: Rent payments are determined by the traffic patterns of 18 real cabs, tracked by satellite. Players collect or pay rent depending on where the cabs go, with the high tally winning at the end of each day."