I have my settings on millimeters, as a draftsman I'm used to work with that. When I make props for poser in Rhino, I make the first in millimeters and scale them down to the proportion as mentioned in the Poser 5,6 and 7 manuals as one PNU = 2621.28mm or 8,6 feet ( and not 8 feet and 6 inches as I first thought). Unlucky enough no-one seems to care about that proportion, V3  for example is 6,3inch or 1930mm high compaired to that proportion as we have seen in a recent thread. Because I dream in millimeters I always convert tutorial dimensions to millimeters to give myself a comprehesion of what size I'm working with. Although I have to admit that it is sometimes difficult to find what units are used in the tutorial especcially when it comes to things like Ambient occlusion. I think that it's important when you write a tutorial that you mention the unit you are working with. Poserunits, millimeters, feets or myponian goatsteps.

-How can you improve things when you don't make mistakes?