Found at Ride Fast & Shoot Straight.  I've done this kind of thing before, but what the heck.  I'll bold the ones I read.  Asterisking which ones I loved is kind of strange.  There were some I loved at the time but now am kind of ambivalent about.  There are none on the list that I started but didn't finish, nor are there any that I outright hated (although frikkin' Shannara comes pretty close).  But of course I have to comment on some of them.

The Lord of the Rings, J.R.R. Tolkien
(plus Unfinished Tales, and all sorts of other stuff that most people haven't forced their way through, but not nearly as much as a friend of mine who is a real Tolkien scholar)
The Foundation Trilogy, Isaac Asimov
(plus the fourth book that I think finally finished the story)
Dune, Frank Herbert
(all of them, not counting the stuff that his kid churned out after he died--multiple times)
Stranger in a Strange Land, Robert A. Heinlein
(not a really huge Heinlein fan but I read this and a few others)
A Wizard of Earthsea, Ursula K. Le Guin
(the whole series)
Neuromancer, William Gibson
(I went through a phase during which I considered cyberpunk the only authentic sci-fi of the time--an opinion I no longer hold)
Childhood’s End, Arthur C. Clarke
Do Androids Dream of Electric Sheep?, Philip K. Dick
(and lots of other PKD, for that matter)
The Mists of Avalon, Marion Zimmer Bradley
Fahrenheit 451, Ray Bradbury
(and The Martian Chronicles is one of my favorite books)
The Book of the New Sun, Gene Wolfe
A Canticle for Leibowitz, Walter M. Miller, Jr.
The Caves of Steel, Isaac Asimov
Children of the Atom, Wilmar Shiras
Cities in Flight, James Blish
The Colour of Magic, Terry Pratchett
(several--how many, I'm not sure--of the Discworld books)
Dangerous Visions, edited by Harlan Ellison
Deathbird Stories, Harlan Ellison
The Demolished Man, Alfred Bester
Dhalgren, Samuel R. Delany
Dragonflight, Anne McCaffrey
(the whole series, including hunting down all the short stories)
Ender’s Game, Orson Scott Card
The First Chronicles of Thomas Covenant the Unbeliever, Stephen R. Donaldson
(First and Second Chronicles--twice.  This is one series I "loved" at the time.  I heard he's putting out some new ones starring Thomas' son.)
The Forever War, Joe Haldeman
Gateway, Frederik Pohl
Harry Potter and the Philosopher’s Stone, J.K. Rowling
(first three)
The Hitchhiker’s Guide to the Galaxy, Douglas Adams
(whole series)
I Am Legend, Richard Matheson
Interview with the Vampire, Anne Rice
The Left Hand of Darkness, Ursula K. Le Guin
Little, Big, John Crowley
(had to try three times before I got the swing of it and read the whole thing)
Lord of Light, Roger Zelazny
The Man in the High Castle, Philip K. Dick
Mission of Gravity, Hal Clement
More Than Human, Theodore Sturgeon
(don't think I read this, but my favorite of his is "The Cosmic Rape")
The Rediscovery of Man, Cordwainer Smith
On the Beach, Nevil Shute
Rendezvous with Rama, Arthur C. Clarke
Ringworld, Larry Niven
(and the sequel)
Rogue Moon, Algis Budrys
The Silmarillion, J.R.R. Tolkien
(yep, see above)
Slaughterhouse-5, Kurt Vonnegut
Snow Crash, Neal Stephenson
Stand on Zanzibar, John Brunner
The Stars My Destination, Alfred Bester
Starship Troopers, Robert A. Heinlein
Stormbringer, Michael Moorcock
(all Elric books, all Corum books, all Hawkmoon books, the Jherek Carnelian books, but was never able to slog through the Jerry Cornelius books--tried twice)
The Sword of Shannara, Terry Brooks
(give me a break, this is fluff at best--sheesh--why didn't they just put "Urshurak" on the list?)
Timescape, Gregory Benford
(I tried to read something else by him once.  It stunk.)
To Your Scattered Bodies Go, Philip Jose Farmer

So there you are.