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Yeah, it's hard to parse "app books," since it could mean so many different things. But my thought is something like Gray's "The Elements."
But the market for this kind of app is pretty limited to those books which are: (1) largely visual or musical; and (2) in which the visual elements can be enhanced in the app form.
This would basically include certain coffee table books (probably the best category for "The Elements"), certain children's books, and certain other largely visual books ("Arms and Armor of the Crusaders;" or "Interactive Maps of Ancient Battlefields" or "Mozart's Pianos", for example).
The App form is probably best for these because they are doing very different things. But I don't see apps for regular e-books being popular at all.
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