Applied Category Theory

This is a gentle introduction to applied category theory - more about the history of the subject, what people are trying to do, and my own personal involvement than any actual math. I gave this talk on June 6th at David Corfield's Seminar on Applied Category Theory.
For the whole seminar, and my slides, (which have links to more information in brown) go here:
math.ucr.edu/home/baez/ACT/