I ran OS X on my PC a couple days after they started releasing x86 versions of OSX. Ran really crappy back then. It was very hardware specific (which makes complete sense since that's what apple is all about). I've downloaded a couple images to try it again but haven't gotten around to it. Maybe I will

A celeron processor isn't going to cut it for the GUI. SSE3 is required.
This is exactly what apple didn't want to happen. The whole philosophy behind apple is that they want total control of the hardware which their software runs on. They write their software to be very hardware specific. While I don't agree with that philosophy at all, it's how they do it. Don't expect a very good experience trying to use old hardware to run OSX. For that you want to run OpenSUSE, Ubuntu, Debian, etc. If you want OSX to run well on a PC you'll have to buy some specific hardware.