This document discusses various Web 2.0 technologies and how libraries can utilize them, including blogs, RSS feeds, wikis, instant messaging, and Flickr. Blogs can be used to promote the library and create dialogue. RSS feeds can notify patrons of events and updates. Wikis allow for collaborative sharing of information among library staff and patrons. Instant messaging can facilitate reference services. Flickr and other sites allow libraries to share photos and images. The document provides examples of libraries using these technologies and best practices for implementation in libraries.