Urbanspoon’s iPhone application is a fun, engaging app that uses the features of the iPhone and location awareness to create a unique local discovery experience.
They are now showing a heatmap (thanks to High Earth Orbit) showing where the shakes have been taking place for the last 24 hours:
According to Urbanspoon:
300,000 iPhones have downloaded the application
1,000 shakes a minute at peak
20 shakes per iPhone
10 days so far