>"Dust" is often something people site is
> missing in raytraced images but something that is extremely hard to
> simulate. I've sometimes found that using a small normal of any type on
> objects can make them seem a bit rougher, sort of like they are covered in
> dust, but not really.

Here is a cite that might help:
http://www.dvgarage.com

It seems like this guy made his career "dirtying things up".Two tutes in
particular might be useful: the crate and the parking lot.
Short of resorting to image maps like he does you might try the new slope
pattern mapped into the pigment_pattern.

There is some nice modelling here. I see I'm not the only one with a blown
monitor or two that I don't know what to do with :)

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