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If you do a search for 'Hackintosh', you'll find a wealth of information about running Snow Leopard or other forms of OSX on a PC - you can dual boot the 2 operating systems. Macs and PCs are built on the same PC architecture these days, so it's a lot easier to install OSX on a Windows machine than it once was.
I'm thinking of getting a PC specifically to turn into a Hackintosh, just so I can use iBooks Author and start developing iOS Apps... it seems a far more cost effective way than buying a Mac! I already have Snow Leopard from an attempt I made to turn a laptop into a Hackintosh a couple of years ago - it unfortunately had an AMD processor and ATI graphics card, whereas Macs use Intel processors and NVidia graphics cards.