TheCarDesigner.com gives an insider's view into the car design process. The format is unusual - you have to enter your email address, and they will then email you a link to access the current feature. Right now it is the story of the 2005 Ford Mustang. The info is great, with sketches, clay models, spy photos of the camoflaged car on the test track, and lots of text explaining why, what and how they did what they did. Well worth giving up your email for this content.