Forbes.com: Apple's Panther Makes The Grade

Expose with a single key shrinks all open windows to be seen at once so you can select the one you need quickly or hide all of them off screen so you can see the desktop; fast user switching with 3D revolving desktop; FileVault 128 bit encryption targeted at iBook and Powerbook; final version of iChat AV; enchanced e-mail program (Mail) which will connect to Microsoft Exchange server for retrieving your office mail in a Windows environment; and not helpful was a new feature called "smart searching" which seemed to slow the entire search down for every letter typed with no way to turn it off. ($129 single; or $199 five-seat family pack)