Personally, I really liked the modified Platinum UI from MacOS X DR2 code named Rhapsody, though it could have used some polish: http://www.guidebookgallery.org/screenshots/rhapsodydr2
Interesting. I feel like the current OS X UI is just that: Rhapsody with a lot of polish. The core concept seems to be the same.
Personally, I really liked the modified Platinum UI from MacOS X DR2 code named Rhapsody, though it could have used some polish: http://www.guidebookgallery.org/screenshots/rhapsodydr2