UnSuggester

This is a good way to waste your time: The UnSuggester. It's easy to understand, but I'll explain it anyway. Type in the title of a book that you like and the Unsuggester will lists books that are least likely to share a library with your suggestion. (It will also give you good suggestions as well which isn't as fun).

For most of my choices the Unsuggested choices were Christian-related books... hmmm...

An example:

UnSuggestions for Catch-22 a novel by Joseph Heller
6,208 members (15 more popular); 59 reviews; average rating 4.26 stars. Members with the book have have a total of 2,250,240 books in their libraries (see good suggestions).

Humility : true greatness by C.J. Mahaney (expected 44.4, found 0; unsuggestions)

The legacy of sovereign joy : God's triumphant grace in the lives of Augustine, Luther, and Calvin by John Piper (expected 40.1, found 0; unsuggestions)

The treasury of David by C. H. Spurgeon (expected 37.5, found 0; unsuggestions)

New Testament introduction by Donald Guthrie (expected 35.8, found 0; unsuggestions)

Jonathan Edwards, a new biography by Iain H. Murray (expected 35.8, found 0; unsuggestions)

Pierced by the word : thirty - one meditations for your soul by John Piper (expected 32.3, found 0; unsuggestions)

Fool's gold? : discerning truth in an age of error by John MacArthur (expected 32, found 0; unsuggestions)

The book on leadership by John MacArthur (expected 30.9, found 0; unsuggestions)

War of words : getting to the heart of your communication struggles by Paul David Tripp (expected 27.7, found 0; unsuggestions)

Faith works : the gospel according to the Apostles by John MacArthur (expected 27.4, found 0; unsuggestions)