In "Hypertext and Critical Theory," one of the points concerning hypertext on which Landow chooses to quote the pervasive Derrida is the status of the book: "The form of the 'book' is now going through a period of general upheaval" (Derrida in Landow 47). Hypertext, Derrida (and by association, Landow) claims is the rising star of the textual world, due to its fewer limitations.
Looking at how the publishing industry (and a number of others) is being swiftly dominated by electronic media, I would say that the E-book is doing for print what a timely meteor shower did the dinosaurs, only more slowly and with less mercy. Although bookshops are still to be found (for now), I'm already grieving for this dying format. One day books will make kids do double-takes of the kind inspired by the record in the mp3 age.
"Hypertexts," Landow writes, "relate directly to performance, to interaction" (41). The E-book does offer more interactive advantages than the book; Project Gutenberg, for example, allows for a range of text connection, whether you want to find a collection based on their topic, publication year, authors, or even language. The same would be true for any quality E-bookstore. In a traditional library, you are obliged to wander adventurously on your own or get help from a Dewey Decimal-savvy librarian.