Just to add to the twist. PearPC on the PC allows one to run OS X in a window (like, Virtual PC but the other way round). It is very very slow, but as soon as you get an intel version of OS X, PearPC is going to be a god send for PC users. Apple can't stop PearPC now... will it be able to in future?
The way I see it, PearPC = more copies of OS X sold = more money for Apple = demise of Mac hardware. (This may not just be PearPc.. as soon as someone cracks OS X to run on any hardware!)