Click here to read Ezra Klein's jaunty take on the present and future of printed and electronic books in the Columbia Journalism Review (it's called "The Future of Reading", but that's a much more complicated topic than he tackles here). Nothing new (must we hear one more time about marginalia? Do we really need someone to tell us that one of the advantages of the electronic book is that it can be updated by subscription?), but in one short article he pulls together a lot of the discussion of content delivery systems--mainly the Amazon Kindle but a bit on e-books in general--and their possible impact.
While you're on-line, take a look at Sven Birkerts' article on literary blogging and reviewing from July, 2007: thoughtful, experienced, self-interested but fair.