The different tabs for Summary, Info, Options and Artwork all have shortcut keys that toggle to them: Command-1, Command-2, Command-3 and Command-4.
I hope that more programs implement this structure when they have tabbed dialogs! I suppose first they need to follow Apple's example and implement the standard "first letter of a button is the Command+shortcut key" scheme (in this dialog, Command+N for Next song and Command+P for Previous), but one can home more will follow suit!

