I dual boot xp and vista for a couple of months now and from my limited experience I noticed the following areas: * Better power management (AA1 under Vista does not necessarily use less power, but it seems to be running cooler) * Pleasant GUI * Built in security features * Stability * Better integrated driver base (BT, mouse, etc), I guess this area various among users * The ability to use ReadyBoost (good feature but no deal breaker) * Better disk management I'm in a position that I have better use for my copy of Vista, so I'm thinking about going back to XP. My question is, does Vista really improve battery life for the AA1? I tried to compare the two but I haven't seen any difference. Do you guys think Vista is good enough to justify using Vista over XP?