OK article, but which book is referenced?

Quite a good article, though not terribly original:The Observer | Business | John Naughon: Microsoft is a victim of its past monopolistic success:

"Therein may lie the real significance of Open Source. In a perceptive book published in 2004, the social scientist, Steve Weber argued that it's not Linux per se but the collaborative process by which the software was created that is the real innovation. In those terms, Linux is probably the first truly networked enterprise in history."

Does anyone know which book is referred to above?

One factor not mentioned is the power of potential ridicule: poor design work can be obvious to all, whereas in corporate they can be hidden and design improvement decisions can easily made subordinate to schedule decisions.