I just remembered that I have this Spongebob Squarepants Original Theme Highlights CD. Not a movie soundtrack but still… it was made into a movie.
I now have:
The Blues Brothers
Robots
The Simpsons Movie
WALL-E
A Bug’s Life
The Incredibles
These aren’t really movie soundtracks:
Billy Elliot The Musical
Spongebob Squarepants: The Yellow Album
Spongebob Squarepants: The Best Day Ever
Edited by TSS: Combined both Posts
Hmm… lets see…
Ice Age 2
Ant Bully
Chronicles of Narnia: Lion, the Witch, and the Wardrobe
Finding Nemo
Transformers: The Score
August Rush
Monsters Inc
A Bug’s Life
Juno
Spiderwick Chronicles
The Dark Knight
Meet the Robinsons
Nightmare Before Christmas
The Incredibles
Total: 14 
I used to have Wall-E and Ratatouille, but accidentally deleted them. 
Soundtracks I own:
Star Wars Episode I
Star Wars Episode II
Star Wars Episode III
Star Wars Episode VI
(still need to get IV and V)
Lord of the Rings: The Fellowship of the Ring
Lord of the Rings: Return of the King
5 disc Disney collection
Brother Bear
The Lion King
Tarzan
I’m gonna count video games
Kingdom Hearts
(I’ll be getting the KHII soundtrack and Piano Collections as soo as I get more moeny)
True Blue: The Best of Sonic The Hedgehog
When I looked at this thread I was thinking, “I don’t really have any soundtracks”. Then I read your posts and saw a few things I had, so I got curious and went through my iTunes. Turns out I have a few!
Songs From Ally McBeal, featuring Vonda Shepard
Animal House
Aladdin
Aladdin & The King of Thieves (includes songs from Return of Jafar)
According To Jim (Jim Belushi & The Sacred Hearts second album)
Bad Eggs
Best of Bond, (James Bond)
Biker Mice From Mars (essentially a themed Jeff Scott Soto album)
The Blues Brothers
Blues Brothers 2000
Cars
Dr. Horrible’s Sing-Along Blog
How High
Spinal Tap
DocKenobi, I also have True Blue, and every other Sonic vocal traxx album! Sonic songs always rock, especially those written and performed by Crush 40 
Yeah, I’m quite fond of Crush 40. I was tempted to buy Sonic and the Black Knight just for their new song, Knight of the Wind.
I’m really more into Sonic from Gensesis to Adventure, so I only have True Blue.
I’m only really into Sonic from Genesis/Megadrive, too. I wouldn’t pay SEGA for the half-assed efforts they’ve put out out since. I only keep track of the new sonic games for potential new Crush 40 songs, as I’m a huge fan of the vocalist, Johnny Gioeli, also from the bands Hardline and Axel Rudi Pell.
Speaking of Hardline - to remain on topic - I also have songs of theirs (when they were still named Brunette) that were written and recorded for a movie called “Smash, Crash & Burn” that never ended up being completed, though the soundtrack was.
Well Here we go!
Toy Story
Toy Story 2
Monsters Inc
The Incredibles
Cars
Ratatouille
WALL-E
Tarzan
Bolt
Camp Rock
High School Musical
High School Musical 2
High School Musical 3: Senior Year
Enchanted
Hannah Montana: The Movie
Mamma Mia: The Movie
Pirates of the Caribbean: Curse of the Black Pearl
Pirates of the Caribbean: Dead Man’s Chest
Pirates of the Caribbean: At World’s End
Transformers
Fantastic Four: Rise of the Silver Surfer
Spiderman
I also Own…
Scrubs, House, The Lion King: The Musical, John Williams Collection,Crazy for You, Chess, Phantom of the Opera, Hello Dolly, Oliver, Guys and Dolls, Me & My Girl, Joseph and his Amazing Technicolour Dreamcoat, Starlight Express, Hairspray, Beauty & The Beast: The Musical
Disneyland Resort Paris: 15 Ans de Magique
Disney’s Greatest Hits
Variety of tracks from
Hercules
The Hunchback of Notre Dame
The Little Mermaid
Smallville
Hannah Montana (Songs from and Inspired by Hannah Montana)
Blues Brothers
On CD:
Toy Story 2
Monsters, Inc.
On my iPod:
Across the Universe (2007, Julie Taymor)
On Vinyl:
Yellow Submarine (owned by my parents)
All I have is Wall-E. Not such a soundtrack afficianado.
I kind of meant on CD, not downloaded or whatever. Any way, now I have the 1992 revival version of Guys and Dolls.
I have a few more soundtracks in addition to my Harry Potter ones now:
-NCIS (TV Show)
-Mamma Mia
-Coraline
-The Incredibles
-Monsters Inc.
-Up
-Classic Disney, Vol 1-5 - so partial soundtracks to many of the classic Disney movies.
Oh, boy…soundtracks are practically all I listen to!
Disney and Pixar:
Disney: The Music Behind the Magic
Classic Disney: 60 Years of Musical Magic
The Magical Music of Disney: Cincinnati Pop and Indiana University Singing Hoosiers
Disney Superstar Hits
The Lion King, The Lion King 1 & 1/2, and The Lion King 2
Rhythm of the Pridelands
Aladdin 1, 2, 3,
The Little Mermaid
Beauty and the Beast
Tarzan
Oliver and Company
Fantasia
Fantasia 2000
101 Dalmations
The Great Mouse Detective
Lady and the Tramp
Pinocchio
Rescures Down Under
Robin Hood
The Aristocats
Brother Bear
The Emperor’s New Groove
The Hunchback of Notre Dame
DuckTales: Treasure of the Lost Lamp
Mickey, Donald, Goofy: The Three Musketeers
Treasure Planet
Bolt
Dinosaur
Nightmare Before Christmas
Enchanted
Who Framed Roger Rabbit
Narnia: The Lion, the Witch, and the Wardrobe
Pirates of the Caribbean Curse of the Black Pearl, Dead Man’s Chest and World’s End
Toy Story and Toy Story 2
A Bug’s Life
Monsters Inc
Finding Nemo
The Incredibles
Cars
Ratatouille
WALL-E
Fantasmic!
Disneyland’s Pirates of the Caribbean
Disneyland Park Official Album
Disneyworld’s Wishes
Other Animated Films:
The Swan Princess
Anastasia
All Dogs Go To Heaven
An American Tail 1 & 2
The Land Before Time
The Secret of Nimh
Shrek and Shrek 2
Flushed Away
Kung Fu Panda
Madagascar 1 and 2
Monsters vs. Aliens
Batman: The Animated Adventure
Cats Don’t Dance
A Charlie Brown Christmas
Ferngully
Happy Feet
Ice Age
How the Grinch Stole Christmas
Corpse Bride
John Williams:
Star Wars: Episodes, 1, 2, 3, 4, 5 and 6
Star Wars: The Clone Wars
Indiana Jones 1, 2, 3, and 4
Hook
War of the Worlds
Hook
Jaws
E.T. the Extraterrestrial
Home Alone
Jurassic Park
Catch Me If You Can
Memoirs of A Geisha
Close Encounters of the Third Kind
Saving Private Ryan
Schindler’s List
The Patriot
Superman: The Movie
Other:
Apollo 13
Batman
Batman Begins
The Dark Knight
Black Beauty
The Mask of Zorro
The Legend of Zorro
Lord of the Rings: Return of the King
SpiderMan 1 and 2
Space Jam
The Looney Tunes Back In Action
Peter Pan
Seabiscuit
Charlie and the Chocolate Factory
Jumanji
Muppet Treasure Island
Sleepy Hollow
X-Men United
World Trade Center
Night at the Museum
How the Grinch Stole Christmas
Broadway/Musical/Show:
The Lion King
The Little Mermaid
Beauty and the Beast
Disneyland’s Aladdin: A Musical Spectacular
Chicago
Mary Poppins
Shrek: The Musical
The King and I
The Phantom of the Opera
The Wizard of Oz
Wicked
West Side Story
Hairspray
Blast!
The Sound of Music
Medieval Times
Am I a geek or what? This is almost too much music to listen to…wow, this is a huge post.
Yeah, John Williams gets his own little section. He’s my all-time favorite composer!
PadawanLinea, I think I have roughly the same number of soundtracks as you do, and yes, soundtracks take up about 90% of my iPod. However, I don’t have it on me right now, so I can’t list them all here, but I promise I will soon. I have a massive John Williams collection, too!
As in the case of PadawanLinea, I ONLY own soundtracks. I own 204 of them.
Let me see…
I have tracks from these films:
The Incredibles
Ratatouille
Monsters, Inc.
Cars
Toy Story
Toy Story 2
Up
A Bug’s Life
Mission Impossible
Jurassic Park
Indiana Jones: Raiders of the Lost Ark
Harry Potter and the Sorcerer’s Stone
Harry Potter and the Prizoner of Azkaban
The Big Chill
Forest Gump
A Walk to Remember
Milk
Tropic Thunder
The Sound of Music
Nick and Norah’s Infinite Playlist
James Bond: Live and Let Die
The Lizzie McGuire Movie
Star Trek
Shrek
Shrek 2
Star Wars: A New Hope
Star Wars: The Empire Strikes Back
Star Wars: The Phantom Menace
Once
The Family Man
Grease
Slumdog Millionaire
Gran Torino
Superman Returns
Hairspray
Rocky
Funny Girl
Charlie Bartlett
Across the Universe
Enchanted
Alvin and the Chipmunks
Almost every Disney movie (too many to mention)
The entire score of The Lion King
and tracks or entire albums of these Cast Recordings:
Of Thee I Sing
Les Miserables
Little Shop of Horrors
West Side Story
Godspell
Cabaret
Seussical
Thoroughly Modern Millie
Rent
Assasins
Fiddler on the Roof
Hello, Dolly
Sweeney Todd
Sunday in the Park With George
Ragtime
Avenue Q
Company
The Phantom of the Opera
Candide
Passing Strange
Next to Normal
Spring Awakening
South Pacific
Oklahoma
Spamalot
Anything Goes
Hair
tick tick BOOM
That’s it.
A quick glance at the soundtrack section of my WMP library (all of which have been ripped from CDs) reveals that I have:
Adaptation.
Being John Malkovich
The Hudsucker Proxy
Ratatouille
Brazil
Birdy
Broken Flowers
Bugsy Malone
Chicago
Dirty Dancing
Flashdance
Grosse Pointe Blank (mainly for the cool Pete Townshend remix toward the end)
Hairspray
La Chambre Du Fils
Little Shop of Horrors
Moulin Rouge
The Rocky Horror Picture Show
When The Wind Blows
Confessions of a Dangerous Mind
The Shawshank Redemption
Wall-E
That’s not including original cast recordings, compilation CDs or TV soundtracks.
Well, I did have The Lion King soundtrack, but I stepped on it and it broke. 
So yeah that was the only one I had. XD
Ha, nice quote.
I have soundtracks for musicals. Chorus Line, Les Mis, Miss Saigon, West Side Story, JCSS, lots others I don’t feel like listing!
I also have Walk the Line.
I don’t really have full soundtracks!
PadawanLinea, you’re a Disney fan, too aren’t you?? 
That proves you’re smart.
John Williams is my personal deity.