Gear Live has a quick article on how to access your iDisk after upgrading to (in my opinion) the inferior iCloud.
• Open Finder and press ⌘K (Command + K) • Enter ‘https://idisk.me.com/yourMobileMeName’ as the Server Address (without the quotes) • Click the Connect button
Very useful since those of us who payed for Mobile Me still have our iDisk for another year!