The M$ download page (no I’m not linking to that;-) says upgrade with confidence. According to my colleagues who have tested it, this might indicate that IE7 faithfully reproduces most bugs of its predecessors, while adding a new set of fun and original ones. There’s a better way.
Worse, it seems like windows update will push this new and improved pile of…software to masses of unsuspecting customers. Be ready for some of these how come I suddently cannot read your site anymore? messages.