In the course of looking this up I found a new usage:

mickey n. The resolution unit of mouse movement. It has been suggested that the `disney' will become a benchmark unit for animation graphics performance.

This is per dictionary.com, which cites as its source the glossary at http://www.jargon.org. Bill, take a look and tell us what you think of the latter. With luck, you'll find some interesting word-posts for us there!