Librarything's Top 1000 Books
This is a list of the most frequently owned books on librarything as of January 2013.
There was a previous list from 2009, but it has changed slightly since then, and the list was never completed, so this is starting from scratch.
There are only 999 books on this list, as one of the top 10 books on the original list is a placeholder for a bug with the site.
List source: http://www.librarything.com/z_books.php