This blog post has been published on 2010-12-26 and may be out of date.
“Toy Story was released by Pixar November 22nd, 1995. One year later Debian 1.1 was released. Bruce Perens was the DebianProjectLeader then and also worked for Pixar. He started the tradition of naming Debian releases after Toy Story characters.” – wiki.debian.org/ToyStory -> Debian