I am not fan of windows either, I'm RHCT but have to use winblows everyday, I have to say that it's become more stable, and with their marketing strategies M$ will rule the PC world for a few more years.
Today I'm kinda neutral for Windows, but really prefer Linux, perhaps for my IRIX background, it's a matter of what you need. And there's not as much development for the enterprise on *nix as there is for windows, obviously, which user base would you chose if you want to meke money selling your application...
On Vista, I'm not sure I like it more than XP or 2003, and I still prefer Firefox over IE7....
Just my humble opinion...