I am still not entirely convinced that the 'code is the law' but code v2 by Lawrence Lessig definitely 'rules'. Code v2 is a sort of a collective update (through a wiki) of Lessig's original 'Code and Other Laws of Cyberspace', which was published in 1999.
The book is downloadable here and it can be construed (in terms of creation, copyright protection (under the creative commons), etc.) as the very epitome of web 2.0 in an academic context.
