I used that for awhile, but when I bought my Garmin Edge 305 for route mapping I started using the utility for course creation by the dude who runs that site. Similar idea, but I can download the map I build to my computer and follow it on my ride.

If you're the type to carry a GPS with you, USA Photo Maps at http://www.jdmcox.com/ is a fun utility as well. You can upload the tracks from your trip and get a look at where you were on satellite, aerial and topo maps.