Web 2.0 is a term often applied to a perceived ongoing transition of the World Wide Web from a collection of isolated Web sites to a full-fledged computing platform serving Web applications to end users, i.e., the next "enhanced" version of the Web. It is also used to describe the social phenomenon that is seen online--open communication (blogs, etc.), social networking, online gaming, and so on. Web 2.0 is also sometimes applied to enhanced organization and categorization of content, emphasizing deep linking (hyperlinks that dynamically link to a specific document, page, or image elsewhere on the Web).
Library 2.0 takes the ideas behind Web 2.0 and applies them to the library environment. "The heart of Library 2.0 is user-centered change. It is a model for library service that encourages constant and purposeful change, inviting user participation in the creation of both the physical and the virtual services they want, supported by consistently evaluating services. It also attempts to reach new users and better serve current ones through improved customer-driven offerings. Each component by itself is a step toward better serving our users; however, it is through the combined implementation of all of these that we can reach Library 2.0. While not required, technology can help libraries create a customer-driven, 2.0 environment. Web 2.0 technologies have played a significant role in our ability to keep up with the changing needs of library users. Technological advances in the past several years have enabled libraries to create new services that before were not possible, such as virtual reference, personalized OPAC interfaces, or downloadable media that library customers can use in the comfort of their own homes. This increase in available technologies gives libraries the ability to offer improved, customer-driven service opportunities." (quoted from "Library 2.0: Service for the Next Generation Library," by By Michael E. Casey and Laura C. Savastinuk (September 1, 2006); http://www.libraryjournal.com/article/CA6365200.html
--Peggy Johnson, Associate University Librarian