Hm, on a thread roll today. 
I did a search and couldn't find any mention of it publically, but I just found a project to get Webkit on Windows. I doubt its Apple supported and since its open source anybody's able to do it.
http://www.getwebkit.org/
Its certinly in alpha stages, the browser itself is pretty bare bones and doesn't support everything (couldn't enter my password in the forums since the box wasn't displayed
) but it interesting to look at and experiment with, not to mention pretty speedy. It has tabs of a sort, more like opera style with it being seperate windows within a window switchable by a tab-like interface rather than actual tabs.
Screenie:

I did a search and couldn't find any mention of it publically, but I just found a project to get Webkit on Windows. I doubt its Apple supported and since its open source anybody's able to do it.
http://www.getwebkit.org/
Its certinly in alpha stages, the browser itself is pretty bare bones and doesn't support everything (couldn't enter my password in the forums since the box wasn't displayed
Screenie:
