Be Thankful for Windows Vista
You're probably not but I couldn't help thinking of a favourite Massive Attack song when I read Chris's list (thanks to a Scoble link).
My #1 Vista favourite at the moment is search. When you get used to is you forget how you ever lived without it. No more hunting menus for programs or folder for files. Just search. It just works. Who'd have thought search would be that cool eh? :)