This document discusses various Web 2.0 and Library 2.0 technologies. It defines Web 2.0 as the second phase of development of the World Wide Web that promotes user participation and grassroots sharing of information. Examples provided include blogging, social bookmarking, podcasting, and photo sharing. Library 2.0 is described as a concept that makes information available wherever and whenever users need it, and ensures barriers to use are removed. Key elements of Library 2.0 discussed are being user-centered, providing a multimedia experience, being socially rich, and being communally innovative. Specific Web 2.0 technologies summarized include blogs, microblogs, music sharing, photo sharing, RSS feeds, social bookmarking, social networks,