I was just thinking the inclusion of thunderbolt could really cut the Mac Pro size down. Put 4 thunderbolt ports on that bad boy, and you can do away with most internal peripherals/slots. Pro users would no longer need internal drive bays. Maybe a slot for an SSD, and a slim optical drive. It would still have to be large enough to accommodate a dual slot video card, but that's it. AJA/Blackmagic already have Thunderbolt capture devices. Hard drive enclosures are in the works. I could see a mini tower in the future - about a quarter of the size of the current Mac Pro. Just thinking out loud and looking at how giant the Mac Pro currently is, and how much space is wasted.