From the Guilty Secrets survey by Spread the Word, the top ten books that people say that they've read but haven't.
1. 1984 by George Orwell (42%)
2. War and Peace by Leo Tolstoy (31%)
3. Ulysses by James Joyce (25%)
4. The Bible (24%)
5. Madame Bovary by Gustave Flaubert (16%)
6. A Brief History of Time by Stephen Hawking (15%)
7. Midnight's Children by Salman Rushdie (14%)
8. In Remembrance of Things Past by Marcel Proust (9%)
9. Dreams from My Father by Barack Obama (6%)
10. The Selfish Gene by Richard Dawkins (6%)
I've read 1, 6, bits of 4, and started on 10 but didn't get more than 20 pages in. (Sorry, Dawkins!) This is a UK-centric list...I wonder what the US list would look like.