Like Orson Welles, he's most famous for the products of his early career, even though he continued to produce work through out his life until he died in 1966. His most famous works were the Alice Comedies and a little character named Oswald the Lucky Rabbit. After the massive success of these two franchises he went on to create another character, this time a mouse but it never achieved the same fame as Alice and Oswald.Link. Sean's post is fun, but incomplete. For instance, I heard that one time Walt Disney was eating at a diner. And when some dude dropped a spoon Walt Disney killed the whole town. My friend Mark said that he saw Walt Disney totally uppercut some kid just because the kid opened a window. And that's what I call REAL Ultimate Disney!
Another thing you could say about Walter was that he was a man who appreciated efficiency and didn't like wasting time. In what can only be called a predecessor to many web 2.0 companies dropping the letter "e" from their name to create catchy brands like flickr and dopplr, Walter also shortened his name with the intent of saving an extra syllable every time he would introduce himself. Walter took it a step further than the modern versions and dropped both the last "e" as well as the following "r." Unfortunately this didn't stick as well as he'd hoped and no matter how many times he tried to tell people his name was Walt, they always ended up calling him Walter.
Update: ZOMG here's Cory dancing on his grave! No, okay, standing next to it. Still, cool. Link.