This article, about a "wiki novel" experiment where a traditional book publisher invited web users all over the world to write a new novel collectively, mentions Lawrence Lessig's book "Code: Version 2.0" as an example of "wiki-editing":

"Web-friendly authors had already embraced the notion of wiki-editing... Lawrence Lessig's 'Code: Version 2.0,' an updated version of the Stanford professor's 2000 classic, was released in December after being vetted and re-edited on a public wiki."