This is a neat idea, although currently I can't really figure out what the deal is. It seems that I'll have a really effective car, and then the next round, I'll end up with a completely new set of cars, none of which resemble the previous winner, and all of which are less effective.

Anyway, would would be really cool to see would be something like Picbreeder, but for cars, where you can manually choose which cars to breed, then let them evolve on different courses, etc. Having some extra control over the situation would make for something extremely addictive.