The document discusses how Web 2.0 technologies like blogs, wikis, social tagging, and user-generated content can influence libraries and the role of librarians. It describes various Web 2.0 services and tools like del.icio.us, Flickr, YouTube, and how libraries can adopt these technologies and principles of Web 2.0 like openness, linking, and reuse to engage users through Library 2.0 initiatives and make library resources more accessible online through OPAC 2.0 and widgets. The document advocates that librarians embrace their role as Librarian 2.0 by experimenting with these new services and being open to changes in how libraries can better serve users in the Web 2.0 era.