http://tags.library.upenn.edu/tag/tagging+books PennTags Feed http://tags.library.upenn.edu/makerecord/url/18594 http://tags.library.upenn.edu/makerecord/url/18594 LibraryThing's Tagmash pulls together books at the intersection of 2 tags (e.g. dog &amp; humor). Something like LCSH strings created on the fly ;) http://tags.library.upenn.edu/makerecord/url/14630 http://tags.library.upenn.edu/makerecord/url/14630 Compares tagging on LibraryThing to Amazon&nbsp; (written by the LibraryThing founder)<br /> http://tags.library.upenn.edu/makerecord/url/384 http://tags.library.upenn.edu/makerecord/url/384 Web application LibraryThing lets you catalog all the books you own and use tags to organize your collection.<br /> Add book titles by entering a title and viewing search results from the Library of Congress or Amazon. LibraryThing adds the book&rsquo;s card to your catalog with ISBN, publisher, year and an image of the book cover. You have space to add a book summary, tags, your comments and a review. See what other users also have each book in their library and what they&rsquo;ve tagged it. LibraryThing is an impressive cataloging app that feels like del.icio.us for books.