From T.V Raman at the W3C Tech Plenary XML Applications: 2^W: The Second Coming Of The Web
Where Web 1.0 was about bringing useful content to the Web, Web 2.0 is about building Web artifacts out of Web parts. URLs play a central role in enabling such re-use --- notice that a necessary and sufficient condition for something to exist on the Web is that it be addressable via a URL.The post puts the REST design principles and the importance of Web Architecture in perspective.
