I've ordered my new Mac Pro system. It will be a while until it gets here as I went with the 8800GT video option.
Anyway, I'll be setting up bootcamp partitions for WinXP, Vista64 and OSX Leopard. Does anyone know if OSX 10.4 / Tiger will run on these latest systems, as in including all proper drivers, etc? Either way, I'll try it when the system arrives if no one has an answer. IMO, 10.5 still isn't ready for prime time just yet, but that's what ships on the new systems.