Hi,
I am running Windows 7 and Mac OS Snow Leopard 10.6.6. Snow leopard is not running perfect yet, sound issues and screen resolution is low. I built my PC with the purpose of running dual boot. I also forgot it is not booting into snow leopard with out a boot disc yet, so i sitll have a few issues to deal with. It is possible and if your system wasn't built with it in mind it may just take you a bit longer to get it up and running. It can be a nice break from using windows. Try
tonymacx86 Blog , this is also another good site / page to use
Lifehacker, tips and downloads for getting things done
I hope this helps, if you have q's please ask.
Stu.