Here's another terrific free site. No, sorry, wrong NFB.
Canada's National Film Board, however is the world leader in indie animation. They've produced dozens of little-seen Oscar nominated shorts. I haven't explored this site much but they seem to host a lot of stuff. Neighbours is quite good.
It doesn't look they have Madame Tutli-Putli available on their site, but I found it here. Really great, if you have 17 minutes.