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(Apologies for cross-posting to C4Lib and NGC4Lib.) thingISBN, LibraryThing's FRBR-ish ISBN-to-related-ISBNs API, is now available in feed format—one giant XML file to take and do with what you please. It's free for libraries and other non-commercial users. http://www.librarything.com/thingology/2007/03/thingisbn-data-in-one-file.php