How it works: LibraryThing Suggester analyses the more than twenty-eight million books and thirty-five million tags LibraryThing members have added, and comes back with reading suggestions. Amazon suggestions come from Amazon.com, not LibraryThing.

Notes: (1) "Books with similar library subjects and classifications" mines what LibraryThing knows about library-assigned subjects (mostly Library of Congress Subject Headings), Library of Congress Classifications (LCC) and the Dewey Decimal Classifications (DDC). (2) The Amazon recommendations exclude items for which the Amazon API omits International Standard Book Numbers (ISBNs), usually because the item is not a book. (3) LibraryThing's suggestions are © 2005-2007 LibraryThing.com, LLC. Dewey, Dewey Decimal Classification, DDC, and OCLC are registered trademarks of OCLC.