The document discusses the evolution of libraries from Library 1.0 to Library 2.0 and perspectives on virtual libraries in the future, termed Library 3D. It provides examples of libraries with presences in Second Life and summarizes preliminary research results from a survey of 19 librarians with Second Life experience. Key activities for libraries in Second Life included volunteering, exhibits, events, and classes. Challenges included hardware requirements, firewalls, and learning curves, but opportunities for research, teaching, and collaboration were seen as important to explore.