Actually I think it started out as a neighborhood thing after the soap box derby was for kids and the grown ups wanted to do something. This is another link to the '08 race. http://vimeo.com/1969266
I believe the guy that does the video editing is Jeffrey Butler and he does a heck of a job too.
I think they are getting smarter with looking for something that has four wheels instead of two or three.
I was eyeing my granddaughter's John Deere 4 wheeler with plastic wheels ( at her birthday party was today) and talking to my wife about it.....she said "no way and get that idea out of your head" in the same breath. I think she realizes what I already know, I don't heal as fast as I used to! I think it would be cool to do this at least once, maybe twice if I made it the first time without crashing! I'll find out from the guy at work on Tuesday how it was on Memorial Day and if he took the Barbie Jeep down, like he said he was.