I really should read Time Magazine more often! I came across an issue brimming with Web2 articles from December 25 2006 - #51.
Web2 (or more directly YOU) is named 'person of the year' for 2006!!!
A good overview of Web2 - plus a nice image mind-map of web2 services (only in print version).
An overview/history and early video of YouTube development.
Also of interest:
Overview of "World of Warcraft".
iPhone Flash Demo.