Now that I have a Blu-ray player and several movies I am fascinated checking out the MBPS rates of each disc. The Spiderman 3 Blu-ray hovers around 30mbps but the Halloween Blu-ray gets up into the 40's MBPS. Why is it different from disc to disc? Is there a reason for it? Also what exactly does it tell you overall about the picture quality if anything? What is the top MBPS a Blu-ray movie can spit out? Sorry if these are stupid questions but as I said I am fascinated. Thanks J.H.