I love when people take something popular and branch off in a new, innovative direction. Entrepreneurship makes me feel like the human race is actually capable of so much more than we already do; it gives me hope. Granted, this idea needs some work to actually be feasible and worth it, especially because it means going backward a bit from digital to tangible. But I'm imagining those singing greeting cards but with an e-book inside them. Wouldn't that be awesome?
Check out this demo for e-books in memory cards.