This document discusses the concepts of Web 2.0 and Library 2.0. It provides examples of how libraries are adopting Web 2.0 technologies like blogs, wikis, RSS feeds, and engaging users in more participatory ways. Examples mentioned include libraries that have implemented blogs, podcasts, tagging features for catalogues, and virtual libraries in Second Life. The document also discusses who the main users are of these new technologies, namely younger "millennial" generations who have high usage of social software and expect to access services anytime on any device.