Certainly there is a change happening in the book world - from self-publishing http://www.lulu.com/ to wikipedia and blogs. Sure there are times when 'hard' copy is useful, structure & sequence, expert review and editorial skills do add value and a tangible asset just makes sense.
When I think about the affordances of the digital world (RSS, collaborative writing, facile annotation, networking, hyperlinking, multimedia) the increasing need to remain updated and aware, the ability to connect, converse and learn separated from time and distance - I'm starting to look at the book as being 'case-hardened' , frozen in place, immutable. When I consider the long editorial and publication cycles, I'm thinking out-moded, plodding, slow and being left behind.
The e-movement is certainly changing things. You may enjoy this new book / pdf / wiki / flick'r group / .... that looks at how knowledge itself is changing.
http://ltc.umanitoba.ca/KnowingKnowledge/index.php/Main_Page - the wiki form