[gizi]

I stopped buying technical books approximately 15 years ago. Nowadays I much prefer (online) tutorials along with the (online) reference manual with user comments. In fact, you could quite easily crowd author and publish these things. We could use better software for that, though, because Wikipedia's mediawiki is only so so for that purpose. Furthermore, most reference manuals and tutorial collections do not sufficiently solicit user commenting and other user participation. Books printed on paper do not allow for user involvement at all. Even for novels, I would prefer to read them with user involvement in one way or another. I cannot imagine one type of book that would not benefit from user interaction.