you really shouldn't cuss people if it takes too long to download for them.... its not good PR..
other than that it looks good..
my only suggestions would be this:
1) Get a tripod

it really makes hte HUGE difference between rpofessional looking DVD's that poeple would buy and those that would jsut end up on youtube etc.. wabbly and shaking cams are not cool, and it makes your shot loose focus of the vehiche etc. and will help stop the camera from lifting when you try to follow the cars down teh track..
also invest in an in-car camera tripod/holder
2) Get and learn Adobe After Effects, there are great tutorials by Lynda.com on bittorrent etc, and that would make your intros and transitions look amazing, it is what is used by all/most big DVD producers for effects like flames, transitions, text effects, camera/lighting effects etc.. once you learn this you'll be on another level.
3) Copyright, make sure only to use mousic that you have permission to use if you plan on selling this.. that can turn around and bite you hard in the ass if any of the artist or their management finid out you are making money off this..
i personally have made allot videos, more for work than hobby etc, but it really looks good, esp for your first try, keep up the good work.. let us know when it is complete..
PS i have some really high res engine and car shots of SKF if ya want, but you'll need SKF permission to use them, you should also ask the different racers for fottage they have, i know Ryan ahs the 7 sec pass and other good footage..
keep up the good work meng..