With the advent of Web 2.0 technologies, user participation in the description and evaluation of content has come to the library. User tagging is almost a given in applications such as Del.icio.us, Flickr, and LibraryThing. The question is whether tagging provided by users with their own motivations is better in some sense then descriptions provided by professionals. Is the tagging provided by the wisdom of the crowd a better description of an item?