Steve Jobs announced that they are bringing Safari, their web browser for the mac platform, to Windows XP/Vista. It's now in public beta, so you can go try it out.
Bad Reviews so far:
Ironically I had it hang on a Macworld article about it. Still very beta in my opinion. Noticed some messing up rendering of Photoshopelementsuser.com
Seems to be much faster than IE7/Firefox in loading pages.
We'll see how it all pans out.