The document discusses various Web 2.0 technologies like wikis, blogs, RSS, photo sharing, podcasts, tagging, social bookmarking, and video sharing that libraries can utilize. It provides examples of how each technology can be applied, such as using wikis for collaboration, blogs for reflections, RSS to deliver updated content, photo sharing to display library images, and podcasts to create audio tours or lectures. The document also mentions challenges of these technologies like firewalls and bandwidth issues but emphasizes that they can engage users and help libraries provide innovative services.