Lecture #9 covered the idea of Nash equilibrium, and looked at the Prisoner's Dilemma and some other classic games.
Notes are available in two formats:
The classic work on the Prisoner's Dilemma is:
R. Axelrod, The Evolution of Cooperation, Basic Books.Anyone interested in the PD is well advised to beg, borrow, or steal a copy (and then read it, of course).