Capture mileage data within a specified boundary (e.g. hometown/local park/particular nat'l forest, etc.)
It would be great to see how many miles I've run in a specific area. Area selection could be user-defined, or perhaps using known boundaries within the mapping software. For example, I'd love to know data on distance, elevation gain, time spent running (or cycling) in my hometown or the local National Forest area.
This can further be expanded by gather everyone's data to tally up and show the most active cities, fastest cities, etc. (maybe based on population?). The data is all there! :)