I have the dirty shaders and the script, don't think it's really what he's looking for...

 

If you do any kind of post-work in photoshop you might want to consider using a recorded action to batch process the animation frames. I've done this to short animation files in Adobe ImageReady.

I'm still leaning toward the use of artifact heavy AO lights... There's a thread in the archives about creating Dirt Maps Using AO. I'll try to track it down.