Well, if you're going to put it on a DVD to watch on your tv then you'll want to go with a 4:3 ratio. This will be for full screen, not letter box. Most tvs support 800x600 resolution or 640x480, and I believe that the dpi is about the same as a monitor (72dpi) not really sure about that though. As far as letter box goes your aspect ratio will be 16:9 (correct me if I'm wrong here guys, but last I cecked this is letterbox.) So that would be roughly 800x380 or 640x300 as far as render resolution. One last thought...Bryce has set render sizes for all of the popular screen sizes. Unfortionately the preview window doesn't size to them as well :( or at least I don't know how to do it! Hope that helped! Jared