PoseRay has to be one of the best free additions for Poser and it's grown to become much more. It also becomes easier to use for rendering Poser scenes with each release. My only problem is needing a faster machine! I'm afraid on my old 1GHz Athlon, POVRay is indeed frustratingly slow, especially using radiosity - which is one of the neatest rendering features. I've just started experimenting with the HDRI feature which looks promising as well and perhaps not quite so slow.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken