- Display a USGS topo map in addition to the standard Google Maps views
- Measure distances
- Import a GPS track
- Create a route, export it to GPS or Google Earth format, annotate it with markers for parking, bathrooms, etc.
- Calculate the number of calories you’ll burn
- Save and track your data (requires registration)
Free, but lots of ads (the price you pay …). Some of the features (e.g. Map Settings, Workout Calculator) don’t seem to work in the Firefox browser, but work in Internet Explorer (Windows).