The document discusses the evolution of libraries from Library 1.0 to Library 2.0 and opportunities for Library 3D. It defines Library 2.0 as a change in user-library interaction enabled by social web technologies. Examples of Library 2.0 include using wikis, tags, and other technologies to encourage participation. The document envisions potential Library 3D applications using virtual worlds for distance education, exhibitions, and health information. Challenges include information overload, privacy, and ensuring quality and accuracy of information.