More appropriate formatting, lower prices, and bundling will sell more e-content..
...not a new device, iPad or whatever. Apple, though, may revolutionize text publishing by using the iPad's launch to rope text publishers into making the changes they've needed to make all along. Namely, increasing their publications' substance-to-fluff ratio, by publishing more stuff in articles (non-fiction) and stories or novellas (fiction) rather than in books. Setting prices in accord with demand, rather than tradition. And letting users buy content in bundles, via subscriptions, rather than forcing them to buy each item by the piece.