Mail Not even one spam has hit my inbox since upgrading to Panther, and email from friends etc... comes through nicely. Message threading is brilliant. Expose Hooked up my Logitech Dual optical mouse and mapped expose functions to it. IMO, this is the way to go with Expose. At least map it to some of the hot corners of your screen; using f9, f10, f11 is far too cumbersome after using it this way. This feature is worth the price of the upgrade by itself. Finder Not sure I really need wonderful utilities like Dragthing anymore. The new finder+the Dock adds exactly the same kind of functionality in a much more streamlined fashion. GUI Enhancements Personally, I disliked the Jag pinstripe skin on application windows and toolbars. The new smooth metal effect is much nicer, more Mac-like IMO. Font Book Apple is listening. Speed I no longer feel like I need a G5. My 1ghz G4 runs smooth as silk and functions nearly flawlessly with this OS. Bravo!