This was a 3 part documentary made by BMW & the Discovery Channel showing the path of the car going through the design, testing & production phases. Even if you're not fond of the big 6 the content is very interesting.
Design:
http://www.youtube.com/watch?v=CaHup6viPIU
Testing:
http://www.youtube.com/watch?v=O9ydcx2ibXA
Production:
http://www.youtube.com/watch?v=6vgJ49NDbvs
Set aside a few hours to watch this.