Sorry Kilanor, I was thinking you were the original author of this thread...who had said he was working in Vue 5. My bad.

While Spectral atmosphere's are great, I've still got a ways to go before I can 'formulatize' them (is that even a word?)

I do know that punching up the Aerial Perspective to somewhere between 20 and 30 really helps create a diminishing horizon and forces a distant haze perspective. For instance:

http://www.renderosity.com/mod/gallery/index.php?image_id=1492090

and

http://www.renderosity.com/mod/gallery/index.php?image_id=1489571

But, I still don't really have an easily explained tutorial figured out for all the rest. There is a lot of dependencies with each setting regarding other settings.