some I have seen and reviewed, but my reviews were lost, so I must watch them again someday to write new ones:
The Cat Came Back
Change Return
A Coffee Vending Machine and Its Sword
The Crunch Bird
Death and the Winemaker
Georeg and A.J.
Gertie the Dinosaur
The Joker's Playhouse
Macabre
Tales of the Black Freighter
...and some other things listed under Disney shorts

things I haven't seen:
World of Tomorrow

And I'm sure there are many other things I'd like to see, which I can't think of at the moment (or have never heard of).