I tried out osx for the first time when osx86 0.4.1 came out. i was more than impressed. the system was still kind of buggy, but i fell in love with it. i used it for about 3 months before i tried updating and inadvertently screwed the system up. I definitely will be a) purchasing a mac in the next year or b) using osx86 leopard if it runs perfectly.
i also had 10.4.8 running like a charm on my desktop for a few months before i also screwed that installation up. i was getting 60-100fps in WoW. Either way osx > anything else IMO.
here's the instructions by the way.
Hack Attack : Install Leopard on your PC in 3 easy steps! | dailyApps