Lol switchfx I'd rather own a mac and run OSX :S
fmw if Parallels is the one I am thinking of it is by far the most ideal virtualisation program for mac. I'm just double checking with a colleague who showed me that though.
The OS itself will never actually run windows software. The hardware really plays one of the smallest parts in what runs where. Just look at the NetBSD project which runs on everything from xboxes to mini computers powered by potatoes (it works, i kid not i've even logged into said machine). Mac's move to the intel platform does not change the fact that it is based on a Unix kernel and thus will run code from mac, linux, and BSD natively without virtualisation.