I'm assuming you would like to be ablt to use if globally, or at least in IE/Firefox, not just be installing Safari as other have suggested.
Back in the days wen Mac OS X was still in development, there was a plan to release the Cocoa framework for windows, to allow applications written to it to run natively on Windows with a recompile. I suspect that set of Cocoa windows libraries (Yellow Box wasn't it?) would have given you Mac OS X style font rendering but I don't think it was ever released (though you may be able to get very old beta versions of it from somewhere, and I have a feeling some of it was somehow part of WebObjects or something like that).
I suspect the windows version of Safari is using an internal version of the Cocoa libraries for Windows, whcih is why it has Mac OS X font rendering (though I believe recent nightly builds at least have the option to use Windows' native font rendering for those who were complaining about it looking out of place).
Anyway, long store short, unless you're going to write your own font renderer, I don't think there's any easy way to do it (other than using Safari)