It's a nice introduction to basic HDRI use. The one Ringo did is pretty nice, too. (http://www.gamers-cafe.com/HDRI.viewlet/HDRI_viewlet_swf.html) One question: In a scene I am currently working on, I have an HDRI set as the background, but I have the skylight turned off and things seem to render nicely. If I turn on the skylight, then everything goes very dark and I can't seem to get the lighting right even with various adjustments to the HDR and skylight intensities. Am I doing something wrong?