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The contents is the same, and the fact that you don't think you're entitled to it in all possible shapes means you're still in the 20th century, or are a perfect customer for RIAA and the like, or both.
The 21st century model should be, you buy content at a certain a level of quality, and then are entitled to it in all media forms.
Why would one have to re-buy a book in an incompatible format? Why would one have to re-buy a song he owns on iTunes for some other format?
Amazon has a way to prove that you bought the paper book, convey it to the publisher, and deliver you an ebook for less.
Pragmatic Programmers and Manning and O'Reilly do it on their own for computer books, although in different ways, and it should be encouraged and standardized.
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