RouteGadget is a online tool for drawing and comparing your routes after a race. Can't figure out why your nemesis beat you by 20 minutes? Check out what routes he took! With the addition of splits for each leg or, even better, a gps track, you can run a mass-start simulation that shows you quite clearly where people lost time on the course and which routes were stellar. 

If you're ready to check it out, go to TOC's RouteGadget site. 

Some helpful instructions and hints on how to use RouteGadget can be found at BAOC's RouteGadget site.