radwende.de is a really neat project from Wiesbaden Germany. They use a GPS tracking app to crowdsource bike trips and then turn the information into a beautiful map you can hang on the wall. Of course they use the data too to help determine where people ride in the city to help planners improve bike routes.
Here’s their page for Wiesbaden data and information on how the project works.
They won an award from the Ars Electronica festival and are starting the project in Linz, Austria.