Sure, I think runmap.net especially offers a great mapping-tool and a good way to discover new tracks, but leaves a lot to be desired in the community area. If you could combine great maps with Twitter (Sending messages like: I just ran X miles in Y minutes RandomRunner.com/runID) and a platform to talk to other runners it could be quite a nice service. Don't know how open for integration these two other sites are.

I thought about something similar a while back, but decided against it when I saw the existing sites. I would love to see/use such a service though.