Attached Link: http://www.nerd3d.com

I've just played with this thing so far but am TOTALLY IMPRESSED. It does fog, smoke, smog, haze, volumetric lighting, and he tells me it will soon do rain and SNOW. The image is a quick test render and doesn't really do it justice. What's that? No he's not paying me a thing to plug this thing...it's just really neat!