A number of years ago I was lucky enough to find a box full of animation drawings and cels from the Ray Patin Studios. They were an animation studio in the 1950's and 1960's that produced black and white commerciasl for television.
There is a section on my site where some of them are showcased.
Recently Steve at the ASIFA Animation Archive has been scanning some of the best of them for inclusion in the Archive. To date they have scanned over 250 images. So if you are ever in the Burbank area stop by and check them out or swing by his blog to see what other things he is currently archiving.