Foursquare check-ins show the pulse of San Francisco from Foursquare on Vimeo.

I love how this video shows the pulse, the flow of life, of how San Francisco moves and beats over the course of a day. I cannot help but think that these data should be made more freely available (now only available to FourSquare), and that they would be very useful for city planners to understand how 'hot spots' of activity work.