Just van den Broecke has put together a GeoSkating web page
where users who have access to a GPS unit with Bluetooth technology and a cellphone can collect and augment data on roller-blading / skating routes post them immediately to the Internet. “The key idea is that while skating, GPS position data is being assembled and published to a server through a mobile phone. At the same time the skater can enrich the GPS data with road surface ratings and by submitting media items (pictures, videos). The server will draw geographic maps showing road quality through colouring plus the submitted media on the GPS locations where they were captured. In addition, skaters can also be seen moving in real-time on the map while skating!” The area of focus is currently the Netherlands but I wouldn't be surprised if this idea is picked up elsewhere.