[Engadget] We’re not eager to be the ones who destroy a PC trying to get this to work, but there’s a new PowerPC emulator that’ll sort of make it so you can run OS X on a PC (really depends on how loosely you want to define the word “run”). Install PearPC 0.1 at your peril.

MacSlash article
PearPC Homepage
Gentoo thread on getting it working

Perhaps i’ll give it a whirl. Seems futile at 1/500th of the processor speed though.