The online racing simulator
Qualifying "virtual spectator" thing.
On the WRC on TV, sometimes they used to (they might still do), show a computer graphics runthrough of the leader's superimposed on eachother.

That would rock in F1 actually :P

Maybe that option when loading a quali MPR to show just the best laps of the cars being superimposed. That way it could be seen where a driver didn't do so well.

I guess this could be done by an MPR reading app.