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The engrossing WorldCat, “the world’s largest network of library content and services. WorldCat libraries are dedicated to providing access to their resources on the Web, where most people start their search for information.” It’s a card catalog of card catalogs with all the simplicity of Google. And it’s incredibly useful: after searching a book, you can find out which library has it closest to your house, and how to cite it in APA, Chicago, Harvard, MLA, and Turabian formats. WorldCat was created by the Online Computer Library Center, or OCLC, and they’ve already been data-mining WorldCat with some pretty interesting results.