Nice to see that Garmin Connect now has the option of OSM maps (using the Open Mapquest tiles). It makes it a lot more useful for off-road running/cycling/walking, as it actually includes a lot of paths/tracks, that aren't shown on Google or Bing. Though it might be useful if the paths/tracks were shown at a lower zoom level.
Also it looks like the course creator is using some sort of OSM autorouting. Though it seems it will only route along roads, and not any paths or tracks.