I think one of the worst examples of UI design by Apple is the iCloud website. It's just so slow and clunky. I can't believe more people aren't complaining about it.
Meanwhile, I saw a Microsoft Surface demo at the mall yesterday and their approach to photo sharing via "SkyDrive" is FAR simpler and easier to use than Apple's. You know you're in trouble when MS has better usability than you. Not a good sign.