40s:
NOTHING!
Well, unless you count The Reluctant Dragon, and Victory through Air Power in the WD Treasures sets (both unwatched as yet)
50s-60s:
20,000 Leagues Under the Sea - Special Edition (1954)
Absent-Minded Professor, The (1961)
Darby O'Gill and the Little People (1959)
Mary Poppins - 40th Anniversary Edition (1964)
Old Yeller - Vault Disney Collection (1957)
Parent Trap, The - Vault Disney Collection (1961)
Pollyanna - Vault Disney Collection (1960)
Shaggy Dog, The - Wild and Woolly Edition (1959)
Swiss Family Robinson - Vault Disney Collection (1960)
Three Lives of Thomasina, The (1963)
70s-80s:
Apple Dumpling Gang, The - Special Edition (1975)
Candleshoe (1977)
Cat from Outer Space, The (1978) (Anchor Bay and Disney)
Freaky Friday (1976)
Hot Lead & Cold Feet (1978)
Island at the Top of the World, The - 30th Anniversary Edition (1974)*
North Avenue Irregulars, The (1979)*
Parent Trap, The - 2-Movie Collection
- Parent Trap 2, The (1986)
Something Wicked This Way Comes (1983)
Tron - 20th Anniversary Collector's Edition (1982)
Who Framed Roger Rabbit - Vista Series - DTS (1988)
90s-00s:
Bridge to Terabithia (2007)
Chronicles of Narnia: The Lion, the Witch and the Wardrobe, The - Four-Disc Extended Edition Bookends Gift Set - DTS (2005) (also the 2-disc version)
Enchanted (2007)*
Freaky Friday (2003)
Haunted Mansion, The (2003)
Mr. Magoo (1997)
My Favorite Martian (1999)
National Treasure - 2-Disc Collector's Edition (2004)
Pacifier, The (2005)*
Parent Trap, The - Special Double Trouble Edition (1998)
Pirates of the Caribbean: At World's End - 2-Disc Limited Edition (2007)
Pirates of the Caribbean: Dead Man's Chest - 2-Disc Special Edition (2006)
Pirates of the Caribbean: The Curse of the Black Pearl - Special Edition 3-Disc Gift Set (2003)
Rocketeer, The (1991)
Rookie, The (2002)
Santa Clause, The - Special Edition (1994)
Shaggy Dog, The (2006)
Sky High (2005)
I may be able to pick most of the following up in the next week or two:
The Adventures of Huck Finn (1993)*
The Black Hole (1979)
Cool Runnings (1993)
Flight of the Navigator (1986)
Hocus Pocus (1993)
Iron Will (1994)*
Johnny Tremain (1957)*
Mighty Joe Young (1998)*
Summer Magic (1963)*
Tower of Terror (1997)*
* = unwatched
I'd also like to find the two Witch Mountain DVDs, and then I plan to get the live-action 101 Dalmations and sequel when they are re-released.
While I enjoy films from all eras, I think the 50s and 60s were the best. Almost all of the ones I have listed are absolute favorites.
The 70s films really started getting silly, although there were great ones in that era too, like Candleshoe. Actually, 70s movies in general are under-represented in my collection, as I was a child at that time. I really grew up in the 80s, and that is my decade of choice for non-Disney films.
The 90s-2000s films are more common just because they are fresh in peoples' minds, and probably 99.9% of theatrical films from 2000 on are going to get a DVD release, while the older catalog titles have to "prove" that they are worthy of a release to studio heads. That being said, however, I am certainly enjoying the grander films like Narnia, Pirates of the Caribbean, National Treasure, etc.
)
