I've seen 46. But there are some real oddball choices:
Terminator 2 but not The Terminator!?
The Green Mile. I mean, it's OK, but not in the same leauge as most of the others.
Avengers Assemble!?
Animation: nothing from Japan? Really? The top few animated films of all time are Anime (IMHO).
[spoiler]
Group A (Drama)
1. The Shawshank Redemption
8. American Beauty
4. One Flew Over the Cuckoo's Nest
5. American History X
2. 12 Angry Men
7. The Green Mile
3. Fight Club
6. Sunset Boulevard
Group B (Comedy, Family & Romance)
Spoiler: show
1. Forrest Gump
8. Monty Python and the Holy Grail
4. Dr. Strangelove
5. Back to the Future
2. It's a Wonderful Life
7. Singin' in the Rain
3. Casablanca
6. Eternal Sunshine of the Spotless Mind
Group C (Wartime & Western)
Spoiler: show
1. The Good, the Bad and the Ugly
8. Paths of Glory[b/strike]
4. Saving Private Ryan
5. The Pianist
2. Schindler's List
7. Django Unchained
3. Once Upon a Time in the West
6. Apocalypse Now
Group D (Fantasy & SF)
Spoiler: show
1. LOTR: The Return of the King
8. Avengers Assemble
4. Terminator 2: Judgement Day
5. 2001: A Space Odyssey
2. Star Wars Ep. 5 - The Empire Strikes Back
7. Blade Runner
3. The Matrix
6. Pan's Labyrinth*
Group E (Horror, Mystery & Thriller)
Spoiler: show
1. The Usual Suspects
8. The Shining
4. Rear Window
5. Memento
2. The Silence of the Lambs
7. The Prestige
3. Psycho
6. Alien
Group F (Action & Adventure)
Spoiler: show
1. The Dark Knight
8. Lawrence of Arabia
4. Gladiator
5. North by Northwest
2. Inception
7. Braveheart
3. Raiders of the Lost Ark
6. Aliens
Group G (Crime)
Spoiler: show
1. The Godfather
8. Taxi Driver
4. Se7en
5. Leon: The Professional
2. Pulp Fiction
7. A Clockwork Orange
3. Goodfellas
6. The Departed
Group H(Animation)
Spoiler: show
1. The Lion King
8. Monsters, Inc.
4. Up
5. How to Train Your Dragon
2. WALL.E
7. Finding Nemo
3. Toy Story 3
6. Mary and Max The only one I've never even heard of