Got a chance to check out an early version of OS X Panther today. Very nice. Lots of great touches and features that just make sense. The Expose/F9 feature will be something I use constantly. I might have to develop a split personality just so I can switch between users once in a while for that cool rotating cube effect. Here's a list of top ten features from O'Reilly.
And while we're at it be sure to head over for an audiophile's iPod review at Stereophile Magazine.