Sitting at a session on IE7 at Mix '06 and the quick tabs view looks cool. The new Print Preview is also very neat (allowing you to change the margins and see multiple pages). It's definitely looking good. The word that comes to mind is "finally!"
Still, though, I'm so happy that, working with Flash, I haven't had to worry about browser compatibility issues for the longest time.That said, it looks like IE7 is definitely a step in the right direction for Microsoft.