Local San Franciscans Peter Richards and Susan Schwartzenberg have put together an interesting art project called CabSpotting. The site tracks the locations of GPS enabled taxi cabs in San Francisco, and updates their location on the map every minute or so.
As orders for pick ups come in over the phone, the addresses are automatically passed to drivers. The historical data then forms a series of lines on the map that shows the routes of the cabs. Not too sure what the practical application is here, but it’s a cool project nonetheless.