All of us trying to understand Web 2.0 have been through the painstaking task of reading pages and pages of conceptual text. Yet we often find ourselves debating and arguing over what the Web 2.0 is all about. James Snell seemed to have given a precise definition of Web 2.0 in a nutshell:

chmod 777 web

All it took was just three words to encapsulate the semantics of five pages. Way to go James!