Chimera, the bootloader we all rely on to make our standard PC hardware boot Mac OS X, received an update allowing it to support OS X Mountain Lion. This is great news if you've been looking to try out the new features of Apple's latest operating system, but you may not want to forge ahead just yet.
First of all, to obtain OS X Mountain Lion you need an Apple Developer Account that will cost you $US99 per year. Also, there is no official installation method for Mountain Lion (and there probably won't be until its final release in mid-2012). Nonetheless, a few brave souls on the tonymacx86 forums have been giving it a shot anyway. If you're willing to take the risk of installing a beta version of an operating system on hardware it isn't designed to run on, now's your chance. Grab Chimera 1.8 and challenge the sun.
Chimera 1.8 Update: OS X 10.8 Mountain Lion Support [tonymacx86 Blog]