@Brahms:
Thanks to things like
the Chameleon boot loader and
PC EFI it's pretty easy to roll OSX on your pc,
provided you have a board that is sufficiently mac-like. (see OP for details)
There's still some fiddling with drivers involved (putting the right .kext in the right Directory and rebuilding the caches), but if your google-fu is strong the you more often than not find solutions. (Fortunately writing drivers for mach doesn't seem too hard...)