Do we really need a new version of Windows?
Sure, little things can be improved for certain users so that it's easier to view/find pictures and other silly things like that, but...
Windows XP has run rock-solid for me for the past 3-4 years. I don't see much need for improvement. People are bashing the screenshots for Longhorn already, saying that all it is is Windows XP with a new background and translucent windows (it's an exaggeration, I know).
Is there something you want more out of Windows that any previous version can't give you?