It started as a PR-campaign, but it's growing bigger and bigger. Love to have a brainstorm session on translating other cardboard games in a similar way.
"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."