E-Books. Again.
The iPod let users do one thing that E-Books probably won’t allow you to do: Make your own book. If I could download stuff from and put it on my E-Book Reader, or export web pages to PDF, and the E-Book reader used standard formats (txt, rdf, and pdf), then I’d buy one. But only if it wasn’t more than, say, 10X the price of a hardcover book.
But before that? Not likely.