Web 2.0: A Very Short Introduction
http://www.mercurytide.co.uk/whitepapers/web-2.0-introduction/

Mercurytide
2005

Abstract:

A profound change is happening on the cutting-edge of web development: we are relinquishing control of information. No longer are sites working independently from each other; no longer is information sitting in isolation with no interaction between sites. Rather, the best web programmers are now creating sites that allow information to be reused anywhere.