Magic Kingdom
20,000 Leagues Under the Sea, CircleVision, Davy Crockett Explorer Canoes, ExtraTERRORestrial Alien Encounter, Fantasy in the Sky, Flight to the Moon, Grandma Duck's Farm, If You Had Wings (a.k.a. Dreamflight, Take Flight), Legend of the Lion King, Magic Journeys, Mickey Mouse Revue, Mike Fink Keelboats, Mission to Mars, Mr. Toad's Wild Ride, Plaza Swan Boats, Skyway, Timekeeper.
Decorations and other extinctions.

Epcot
Body Wars, Captain EO, Communicore, Cranium Command, Earth Station, Horizons, ImageWorks, Journey into Imagination (Version 1), Journey into Your Imagination, Kitchen Kabaret (a.k.a. Food Rocks), Magic Journeys, Making of Me, Odyssey, Symbiosis, Tapestry of Nations (a.k.a. Tapestry of Dreams), TransCenter, Universe of Energy (Version 1), World of Motion, Wonders of Life.
Decorations and other extinctions.

Disney-MGM Studios
Doug - Live! Hunchback of Notre Dame: A Musical Adventure, Monster Sound Show (a.ka. ABC Sound Studio), Residential Street, Superstar TV.
Decorations and other extinctions.

Disney's Animal Kingdom
Countdown to Extinction, Discovery River Boats (a.k.a. Discovery River Taxis, Radio Disney River Boats), Journey to the Jungle Book, March of the Animals (a.k.a. March of the ARTimals), Tarzan Rocks.
Decorations and other extinctions.

Walt Disney World (Other)
Disney Institute, River Country, Treasure Island (a.k.a. Discovery Island)

Universal Studios Florida
Alfred Hitchcock's Mystery Experience, Animal Actors, Funtastic World of Hanna-Barbera, Ghostbusters, Hercules and Xena Television Experience, Kongfrontation, Murder She Wrote, Nickelodeon Blast Zone, Nickelodeon Studios Tour, Stage 54, Wild Wild Wild West Stunt Show

Islands of Adventure
Island Skipper Tours, Poseidon's Fury (Version 1), Triceratops Encounter (a.k.a. Discovery Trail)

Orlando (Other)
Boardwalk and Baseball, CircusWorld, Cypress Gardens (pre-2005), Guiness World Record Experience, Hard Rock Vault, Mystery Fun House, Splendid China, Warbird Museum, WaterMania

Links to Other Extinct Attractions on the Web
Extinct DCA - My sister site tracks extinctions at DCA.
Yesterland - Werner Weiss's site about extinct Disneyland. A must-visit.
Widen Your World - An early website on Disney World extinctions. Great detail.
Walt Dated World - Another early website on several Disney World extinctions.
Universe of Energy - Much more info than you can possibly imagine ever existed on this departed attraction. A comprehensive guide.
20,000 Leagues - Photos, narratives, and everything you'd want to know.
Florida's Lost Tourist Attractions - Lists, photos, and narratives about tourist stops and parks statewide that have gone extinct.

Related Websites
MiceAge - news, rumors, opinion about global Disney happenings
Space Mountain Homepage - a comparison of the mountains around the world