Windows 7 review

Improved performance

Pinned icons

Live thumbnails

Jump lists and window snaps make Aero useful as well as attractive

New ways of organising files with libraries

Improved backup

Less annoying notifications

XP Mode isn't an integrated option yet

Microsoft backed down on libraries and Ctrl-E brings up My Computer instead

You can't add NAS drives to libraries

Ultimate edition is almost unnecessary except for adding BitLocker – which should be in the Professional Edition – and rather expensive (as are the Anytime Upgrades)

Yes, it's what Vista should have been (but it's more than that)