Hans Perk over at A. Film L.A. has just recently begun posting the animator drafts of 101 Dalmatians. To me, these drafts are a gold mine! They're very informative & it's really interesting to read & see who animated what throughout the film. As of this post, he's just gotten up to the introduction of the Colonel, Captain & Sgt. Tibs, my favorite scene in the movie!
By the way, he also has the complete drafts for Pinocchio, Three Caballeros, Alice in Wonderland & countless classic Disney shorts up on the site too, so take some time & check his site out!
"On the double, man! On the double!"