I will be writing a quick front end web app to handle registration in the Spring. In fact, I'll probably write it for CR for this Fall's event as well, if Anthony wants it. However, when you sign up with it, you'll be taken directly to PayPal to pay for the event right then and there. If you don't pay, you don't complete the registration, thus you don't sign up.
About not getting 60 cars: I was signed up with two of mine and had the event posted on no less than 5 message boards. It was pushed pretty hard, don't think that it wasn't, but a lot of people didn't pay or didn't sign up for one reason or another. Such is life.
Let's just make sure if we are serious about it for the Fall, that we get the right number of cars this time...