Sci Fi Funk has released a 4 part tutorial showing us how to apply rust shaders to a bunch of imported cars.

How to make rusty wrecked cars Tutorial. Using cheap models how to amend shading domains and apply rust shaders to your 3d models.
I start the tutorial by looking for cheap (low poly) wrecked cars. The only ones I could find that were reasonable priced were (inevitably) in max format. So they need converting to something usable by Poser or Carrara.
I briefly explain how to install 3ds max (for poser people).
The only way I could export successfully was via obj format, but the shading domains are all over the place and I couldn’t get materials out. Even if I had they would need editing to rusted shaders.
I explain how to model cars to make them look wrecked (move doors, bend plains etc).

PART 1 – http://www.youtube.com/watch?v=kyO53Smu6JE (Finding Car models and bringing into Carrara)
PART 2 – http://www.youtube.com/watch?v=8I9HT0-u1c4  (Organising your car models for shader work)
PART 3 – http://www.youtube.com/watch?v=KyoNAGYJKgE (Shader overview)
PART 4 – http://www.youtube.com/watch?v=rw7_jNxb4CU  (Detailed explanations of the shaders)

More info and tutorials from Sci Fi Funk can be found at:
http://www.facebook.com/scififunk
http://www.scififunk.com

Good luck!