Finally done! whoah!
I've had a few problems with dA about this, because it wanted it less than 10 megapixels, so I hope this works :\
It describes how to vector cars, and it's based on [link]
Note: Everyone has their own vectoring style, so you'll evolve after a few vectors from this tutorial. Make sure, that if you a vector a car from this tutorial, drop me a line so I can favourite it ^^
And the stock image which I used in this tutorial is available at [link]
It think that's it....