I feel for people who get stuck with it. Now that my office system is running Vista, I have even more sympathy. I remember my old XP Pro system at idle had around 210 threads (not processes) or so running. Vista, as stripped as I can get it, still runs over 430 threads at idle.
All the things MS is doing in background is rather scary. I would not put anything you wanted to keep a secret on a Vista computer. That is for sure.
Oh, and you have not had any real fun until you try and share something on a Vista box. Or try to run a remote executable from the Vista box. Let me tell you, it is a barrel of laughs.....NOT!!!!! freaking IT nightmare is what it is.