Have you ever wanted to switch to a certain window — not just the application it belongs to? While you can use Exposé to switch windows, doing so can be very clumsy if you're the keyboard-only type of user. And don't all of these windows look just the same when they are scaled down?
Here is Witch the application that can do it. All you need to do is to download the application. Open the disk image, double click on the Witch.prefpane file -> it will install a new panel in your system preferences. Then go to "universal access" in your system preferences, enable "access to assistive devices". And then try this keyboard shortcut: alt + tab.
Amazing isn't it? (iTunes was minimized in the dock)