It's simply cool! Thanks for this great contributions.

The shadows aren't blurred on my system: ATI Mobility Radeon X1400

And the god rays are a little bit weird. They only show up if you are looking directly into the sun. Shouldn't they always be visible? I think also the look of the rays could be improved. Now they look a bit like a bit blurry, instead of looking like this: http://www.youtube.com/watch?v=N6r6tbf4UGU

But these are peanuts! Everything is working for me and looks great

Feature Request: Atmospheric Scattering