mapmyrun.com

MapMyRun.com is a pretty busy site. Looks like it could be an all encompassing site. I have used this to create a 'course' and send to my Forerunner. Pretty easy to do, but it's done by files instead of a direct link to my device. Not ideal, but it works. New maps are all that I'm currently using this for. The 'free' account is kind of a pain sometimes because of the 'advertisements'.

Currently this is the easiest site to create maps for my Garmin because you can export the map you've created in *.tcx format.