WindowsDevCenter.com: Run Mac OS X on a PC
WindowsDevCenter.com has an article on running Mac OS X on a PC. I have heard of the Pear PC emulator project before and I have seen several different articles detaling how to get it up and running, but this one may be the easiest to follow of them all. If you have a fast computer and access an 10.3 install disk, you may want to check the article out.
Apparently, someone has created a Pear PC configuration tool that goes a long way to making the install a lot easier for mere mortals. From the screenshots provided in the article, this tools seems to really simplify the entire install/config process.
Personally though, I am not sure how applicable this article is with the release of the mac mini. For just $629 CAD, you can save yourself the trouble and actually run OS X on a mac.