The Gmap-pedometer is one of the best little Google Maps mashups I’ve seen yet.
Say you want to determine how far you’re walking or jogging on a given route. Well, just head on over to Gmap-Pedometer.com, hit the “start recording” button and double click on points along the path you follow.
The program will keep up with the distance and even give you the option of computing the calories you’ll burn as a result.