This document discusses and compares several tools for libraries and readers to use for cataloging and discovering books. It outlines the features of LibraryThing and Goodreads, two popular sites for creating catalogs and getting recommendations. Other tools mentioned include What Should I Read Next for recommendations, Book Lamp for reading challenges, and Game of Books for a book-themed trivia game. The document provides links to libraries using some of these tools and asks for any other questions.