Well... from 9x up to XP, we've had the same basic hierarchy structure. Vista has changed the way we view our folders and the location of certain items.. I havn't played a whole lot with Vista, but just trying to click around and finish what were small tasks in XP are now great feats in Vista... took me thirty minutes to figure out an internet connection over at my parents house when they got a new router and computer. It was easy to tell you the different between home and pro in XP, but with all the different flavors of Vista, I couldn't tell you the difference between the home premium or basic to the Business Ultimate... dumbest marketing ploy by Microsoft ever... dummies.