Perhaps on a touch screen device one could use a "help mode" which freezes the UI interaction and displays ballon help over each UI element. Tap the balloon an

Perhaps on a touch screen device one could use a "help mode" which freezes the UI interaction and displays ballon help over each UI element. Tap the balloon and it expands with more detailed explanation. The help mode could be triggered by a tap on an always present (?) icon somewhere in the corner.