The car racing competition is now updated, with minor changes to the code, submission instructions, and a hall of fame:
Please consider participating. It's easy to get started, and really fun! (Hah, like I was ever going to tell you it's hard and boring, even if it was... Really, I've tried hard to make it as easy as possible to enter.)
If you decide to give it a go, I would appreciate a mail stating this intention, so I can put your mail address on a list of people to notify in the unlikely event of changes to the rules, code, etc.