I really don't think this is going to be much use to you guys who plan on dual-booting, as it's purely a beta-version of the OS designed to run on existing x86 architecture. In the next week or so, Intel will be announcing their next gen of processors to developers (essentially Pentium 5, but I doubt they'll be calling it that) emphasising multi-core processing and low power consumption. The processors are intended to be out in desktop PCs in mid-06, the exact same time as Apple are bringing out their first Intel boxes. Given that the word is quite a considerable change in architecture from today's processors, it's safe to assume a number of things:
-The current beta x86 release of OSX will be incompatible with the final Intel version of the OS. The current boxes are merely early-beta dev kits to get developers accustomed to Intel processors.
-Apple have most probably scored a deal with Intel such that the two versions of the new processor family (PC and Mac) are different in such a way as to prevent pretty much any possibility of dual-booting on either machine. The hardware business makes far too much money for Apple for them to chance it by allowing their OS to be run on Dell hardware, and given that Apple have probable been in on this new tech for quite a while, they'll have had ample chance to weasel an agreement out of Intel to such effect.