"Base training - that is, pure aerobic training - should compose the bulk of any
distance runner's training." Marc Conoverc, The Running Times Guide to Breakthrough Running
MapMyRun's
Route Planner (MapMyRun.com is a site where you can easily plot maps of where you've route,
find various routes/running trails in a certain area, keep track of your routes including
distances, and even calculate how many calories you've burned on one route verse another!
(according to the website) G-Map Pedometer (map a route anywhere
in the US) USATF's GPS maps (measure courses
by clicking on a map)