I don't use Vista. But on a friend's I liked the tabs on the side.

Not a Vista user.

I like many things about Vista Ultimate. Seems Microsoft spent only a year smoothing out some rough edges, which sure beats the 5 or so years and hundreds of updates making XP a great operating system. The search engine is super and the aero interface is kewl (yes am a Windows Nazi, but love Linux and Free BSD too).

ReadyBoost - I use a 2GB memory stick and notice a considerable shortening of time when handling graphics.

The Aero look.

I don't (and very likely won't) use Vista

I like it's security features

still with XP