One of my favorite UIs of all time. Inspired a then-20 y/o to have a career building complex UIs =)
Missing the late Peter Warner, designer.
Fun historical note: When Steve Jobs flew the Shake team up to Cupertino, he came to lunch for a meet-&-greet. He sat down and said some things; among them was, "Yeah, you guys built this cross-platform UI that looks the same on every platform... but we have people here who know more about UI than you ever will."
Needless to say, the Shake UI remained intact for the rest of its days.