Design Research/Inspiration:

A very nice site for lamborghini:
http://www.lamborghini.com/

created by-
http://www.gigalab.com/

reminds me of the style of 2 advanced, also the video presentation for AIGA San Diego XD3 (on the homepage) is a good example of using video in a website to advertise yourself and entertain visitors-
http://www.2advanced.com/flashindex.htm

most of the luxury car websites are very similar (lamborghini is the exception..). however, I like idea of the search facility on Mercedes Benz site as it should assist visitors to specific parts of the site rather than just have them randomly looking around-
http://www2.mercedes-benz.co.uk

the others-
http://www.bmw.co.uk/apm/index/
http://www.jaguar.com/uk/en/home.htm
http://www3.uk.porsche.com/english/gbr/home.htm
http://www.saab.com/main/GB/en/index_flash.shtml