The RDF book mashup demonstrates how Web 2.0 data sources like Amazon, Google or Yahoo can be integrated into the Semantic Web.The RDF book mashup makes information about books, their authors, reviews, and online bookstores available on the Semantic Web. This information can be used by RDF tools and you can link to it from your own Semantic Web data.Fine. Why doesn't it use Open WorldCat? Or even LibraryThing. It is based on ISBNs, yet it doesn't use the xISBN nor thingISBN services. Maybe someone should clue the authors in.