These are the top 106 books most often marked as "unread" by LibraryThing's users [as of 30 September 2007]. Bold what you have read, italicise what you started but couldn't finish, and strike through what you couldn't stand. Add an asterisk to those you've read more than once. Underline those on your to-read list.
[I thought this would be a fun little thing to do.
]
Jonathan Strange & Mr Norrell
Anna Karenina
Crime and Punishment
Catch-22
One Hundred Years of Solitude
Wuthering Heights
The Silmarillion*
Life of Pi : a novel
The Name of the Rose
Don Quixote
Moby Dick
Ulysses
Madame Bovary
<s>The Odyssey</s>
Pride and Prejudice*
Jane Eyre
A Tale of Two Cities
The Brothers Karamazov
Guns, Germs, and Steel: the Fates of Human Societies
War and Peace
Vanity Fair
The Time Traveler's Wife*
<s>The Iliad </s>
Emma
The Blind Assassin
The Kite Runner
Mrs. Dalloway
Great Expectations
American Gods
A Heartbreaking Work of Staggering Genius
Atlas Shrugged
Reading Lolita in Tehran : a memoir in books
Memoirs of a Geisha
Middlesex
Quicksilver
Wicked : the life and times of the wicked witch of the West
The Canterbury Tales
The Historian : a novel
A Portrait of the Artist as a Young Man
Love in the Time of Cholera
Brave New World
The Fountainhead
Foucault's Pendulum
Middlemarch
<s>Frankenstein </s>
The Count of Monte Cristo
<s>Dracula</s>
A Clockwork Orange
Anansi Boys
The Once and Future King
The Grapes of Wrath
The Poisonwood Bible : a novel*
1984
Angels & Demons
The Inferno
The Satanic Verses
Sense and Sensibility
The Picture of Dorian Gray
Mansfield Park
One Flew over the Cuckoo's Nest*
To the Lighthouse
Tess of the D'Urbervilles
Oliver Twist
Gulliver's Travels
Les Misérables
The Corrections
The Amazing Adventures of Kavalier and Clay
The Curious Incident of the Dog in the Night-time
Dune
The Prince
The Sound and the Fury
Angela's Ashes : a memoir
The God of Small Things
A People's History of the United States : 1492-present
Cryptonomicon
Neverwhere
A Confederacy of Dunces
A Short History of Nearly Everything
Dubliners
The Unbearable Lightness of Being
Beloved
Slaughterhouse-five
The Scarlet Letter
Eats, Shoots & Leaves
The Mists of Avalon
Oryx and Crake : a novel
Collapse : How Societies Choose to Fail or Succeed
Cloud Atlas
The Confusion
Lolita
Persuasion
Northanger Abbey
The Catcher in the Rye
On the Road
The Hunchback of Notre Dame
Freakonomics : a Rogue Economist Explores the Hidden Side of Everything
Zen and the Art of Motorcycle Maintenance : an Inquiry into Values
The Aeneid Watership Down
Gravity's Rainbow
The Hobbit*
In Cold Blood : A True Account of a Multiple Murder and Its Consequences
White Teeth
Treasure Island
David Copperfield
The Three Musketeers
*beep* out of Carolina
And guess what's not on there? LotR! *nod nod*
and I might have read some of them but forgotten. 
anyway, thanks for sharing that, Lar!
Likewise, I want to finish The Canterbury Tales.
There's only one book I ever read and hated. 