We are smarter than me, part II

A few days back I wrote about efforts by Wharton Publishing to involve  a large community in one of it's publishing projects. Now Guy Kawasaki is planing to write another book and this time he is 'open sourcing' the content.

Is this the new way to write books? How does the 'wisdom of crowed' reflect the content? How well will the books be received? How much room will these efforts leave for brilliant insights from an expert - the author?