Here is a good list of mapping sites.

Most of these are built on Google Maps, and feature the same basic interface. I haven’t found one that’s perfect yet. Mostly I use Gmaps Pedometer and RouteSlip. I just found MapMyRide, so I need to play with it a bit more before deciding whether it’s worth staying with.

MapMyRide is really nice. You can move the points around which you can’t do with gmaps. It also has the elevation thingy so I would say it’s the nicest one I’ve seen so far.