My favorite article on Library 2.0 so far is by Michael E. Casey and Laura C. Savastinuk in Library Journal, 9/1/2006, titled Library 2.0: Service for the next-generation library. Here's the excerpt I would most readily agree with and which I believe will give hope to all those who are yet reticent to fiercely embrace new technologies:
"What makes a service Library 2.0? Any service, physical or virtual, that successfully reaches users, is evaluated frequently, and makes use of customer input is a Library 2.0 service. Even older, traditional services can be Library 2.0 if criteria are met. Similarly, being new is not enough to make a service Library 2.0."