LibraryThing
163,217,253 books on the site
I hate to leave my books but when LibraryThing came along I was able to catalog them on my phone. Free.
LibraryThing is an online service to help people catalog their books easily. You can access your catalog from anywhere—even on your mobile phone. Because everyone catalogs together, LibraryThing also connects people with the same books, comes up with suggestions for what to read next, and so forth.1
LibraryThing is Free
Zeitgeist
The Zeitgeist page at LibraryThing gives interesting stats about the 2.6 million members’ books.
Members 2,682,394
Books Cataloged 163,217,253
Covers Uploaded 7,612,512
Top Authors
J. K. Rowling (753,481),
Stephen King (595,220),
Terry Pratchett (454,331),
J. R. R. Tolkien (368,300),
C. S. Lewis (367,300),
Neil Gaiman (349,970),
William Shakespeare (318,155),
Nora Roberts (312,287),
Agatha Christie (297,437),
James Patterson (288,986).
Here is my catalog of books: klmccook’s books. So far I’ve cataloged 1,637. I’m not even in the top 5,000.
Some people have a lot of books
LibraryThing offers powerful tools for cataloging and tracking your books, music, AND movies, with access to the Library of Congress, six national Amazon sites, and more than 2,200 libraries worldwide. Edit your information, search and sort it, "tag" books with your own subjects, and use various classification systems (including the Library of Congress, Dewey Decimal, or other custom systems) to organize your collection. Use the LibraryThing iOS App to scan books to your library from the palm of your hand.
I've been on LibraryThing for over a decade now -- it really is fantastic. (It offers a lot of customization for each book entry too, which we idiosyncratic-perfectionist cataloguers certainly appreciate.) I always enjoy looking through the list of libraries most similar to mine. Great way to find books I might like.
Thanks -- easy to use?