Maybe it's already been mentioned, but I can't remember, and just wanted to get it in here while I was still thinking about it: In the render options, or even in the render progress window, it would be cool to have a readout for approximate RAM required for whatever you're rendering. Also a radiosity/global illumination option. last but not least, it would be cool to have a filter for the lights which cast "tree leaves" shadows in volume, to get the effect of light streaming down past tree leaves through mist when used with a volume light. It can be done with the real trees, but I would think a filter would be faster and more efficient. I can't seem to get it with the "gels".