From off the top of my head:
2001: A Space Odyssey
2010: The year we make contact
A.I: Artificial Intelligence
Alien
Aliens
A Clockwork Orange
Akira
Back to the Future trilogy
Braveheart
Blade Runner (four-disc)
Blood Diamond
A Bug's Life
Black Beauty
Beowulf
The Big Lebowski
Casino Royale (Original Comedy Version)
Casino Royale (Daniel Craig Version)
Chicken Run
Creature Comforts (Original version. Disc also contains a bunch of other Aardman Shorts)
Chitty Chitty Bang Bang
Dr. No
From Russia with Love
Goldfinger
The Godfather
The Rocky Horror Picture Show
Shock TreatmentDie Another Day
E.T
Flash Gordon (Original Serials from the 1930s or whatever)
Flash Gordon (1980 film)
Finding Nemo
Gladiator (I probably have like 5 copies of this film. I wish people would stop giving me it for christmas.)
Fight Club
Firefly (The Complete series, our dimension ;P)
Firefly (Series 2-9, Alternate Dimension)
Independence Day
Inception
Ice Age
Ice Age: The Meltdown
The Incredibles
Jaws
Jumper (Sorry)
Jurassic Park
Jurassic Park 2: Lost World
Kung fu Panda
Kung Pow: Enter the Fist
Labyrinth
Monsters Inc.
Moulin Rouge!
The Muppets Take Manhattan
Muppet Treasure Island
My Big Fat Greek Wedding
The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe
The Chronicles of Narnia: Prince Caspian
Night at the Museum
Night at the Museum 2 (Ugh)
My Fair Lady
Planet of the Apes collection thingy
Plan 9 from Outer Space
Pan's Labyrinth
Predator
Predator 2
Predators
Ratatouille
Scott Pilgrim VS the World
Shrek
Shrek 2
Shrek 3
Spiderman
Spiderman 2
Spiderman 2.1
Spiderman 3
Superman: The Movie
Superman 2
Superman 2: The Donner Cut
Star Wars
The Empire Strikes Back
Return of the Jedi
Rugrats: The Movie
Rugrats in Paris
Star Trek: The Original Series Seasons 1-3
Star Trek: The Animated Series Seasons 1-2
Star Trek: The Next Generation Seasons 1-7
Star Trek: Deep Space Nine Seasons 1-7
Star Trek: Enterprise season 4
Star Trek: The Motion Picture
Star Trek 2: The Wrath of Khan
Star Trek 3: The Search for Spock
Star Trek 4: The Voyage Home
Star Trek 5: The Final Frontier
Star Trek 6: The Undiscovered Country
Star Trek: Generations
Star Trek: First Contact
Star Trek: Insurrection
Star Trek: Nemesis
Star Trek (2009)
The Terminator
Terminator 2: Judgment Day
THX-1138
The Iron Giant
The Room
The Clangers
The Pianist
Oliver!
The Sound of Music
Tron
UP
Watchmen
Wallace and Gromit: The Curse of the Were-Rabbit
Wallace and Gromit in Three Amazing Adventures
Wall-e
The Wicker Man (Original Version)
The Wicker Man (version)
Young Frankenstein
Schindler's List
Schindler's List 2: Schindler's Pissed (;P)
State of Play
Quantum of Solace
Batman Begins
The Dark Knight
Serenity
Mission: Impossible
Mission: Impossible 3
The Bourne Identity
The Bourne Supremacy
The Bourne Ultimatum
The Good, The Bad, and The Ugly
The Lord of the Rings Extended Trilogy Boxset
The Thomas Crown affair (Both Versions)
Elizabeth
Elizabeth: The Golden Age
Thunderball
The Wizard of Oz
The Lady Vanishes
Citizen Kane
You Only Live Twice
Goldeneye
All the Indiana Jones films
Brazil
Moon
The Bridge in the River Kwai
2001: A Space Odyssey
Close Encounters of the Third Kind
Toy Story
Toy Story 2
Toy Story 3
I've Probably missed out a few