http://www.racesimcentral.net/
So far you can:
- Extract setups from replay file.
- Compare uploaded setups and combine them into a new one.
- Upload replays for inclusion in "hot lap" competition.
- View fastest times on different stages.
Ideas of things to come:
- GPL-rank style of ranking of players.
- It might be possible to generate a ghost car from a replay.
- Notification via email when someone beats your time on a stage.