Update

Because the only thing better than making a list is checking things off, here's an update:
Infinite Jest by David Foster Wallace (1,079p) 1.14.09
The Naked and the Dead by Norman Mailer (721p) 1.26.09
A People's History of the United States by Howard Zinn (729p) 2.3.09
Rabbit Angstrom by John Updike (1,516p) 2.16.09
Gravity's Rainbow by Thomas Pynchon (776p) 3.7.09
Of Human Bondage by W. Somerset Maugham (704p) 3.14.09
The Executioner's Song by Norman Mailer (1056p) 3.22.09
Ulysses by James Joyce (768p) 3.29.09
The Life and Opinions of Tristram Shandy, Gentleman by Laurence Sterne (720p) 4.5.09
The Sot-Weed Factor by John Barth (819p) 4.18.09
Anna Karenina by Leo Tolstoy (853p)
The Early Stories: 1953-1975 by John Updike (864p)
The Complete Novels (At Swim-Two-Birds, The Third Policeman, The Poor Mouth, The Hard Life, and The Dalkey Archive) by Flann O'Brien (787p)
The Recognitions by William Gaddis (956p)
The Magic Mountain by Thomas Mann (706p)
The Beatles: The Biography by Bob Spitz (992p)
Mason and Dixon by Thomas Pynchon (773p)
The USA Trilogy (The 49th Parallel, 1919, and The Big Money) by John Dos Passos (1,144p in 3 volumes)
Women and Men by Joseph McElroy (1192p)