This document discusses the evolution of the web from Web 2.0 to Web 3.0, with Web 2.0 focusing on user participation through things like mashups and folksonomies, and Web 3.0 aiming to develop a global, semantically linked database through open standards and metadata. The semantic web of Web 3.0 could benefit librarians by allowing for improved findability, indexing, and classification of resources through ontologies and taxonomies.