» Iterated Prisoner's Dilemma    Information on the Iterated Prisoner's Dilemma, a major topic in artificial life, and a look at cooperation (and evolution of cooperation) between agents.    http://www2.lifl.fr/IPD/

» Prisoner's Dilemma by the constitution web site    Some links on ethical and political aspect of the Prisoner's Dilemma.    http://www.constitution.org/pd/pd.htm

» Stanford Encyclopedia of Philosophy entry    This is a very complete description of the prisoner's dilemma and its variations.    http://plato.stanford.edu/entries/prisoner-dilemma/

» The Prisoner's Dilemma    A simple yet powerful model for the problem of cooperation versus conflict in groups. The JAVA applet demonstrates the spread of 'altruism' and 'exploitation for personal gain.'    http://prisonersdilemma.groenefee.nl/

» The Taumoda Lab    This site offers a way to learn how to study the evolution of cooperation through 3 models, based on the Prisoner's Dilemma. (Java applets included).    http://www.taumoda.com/web/PD/lab.html

» Xerox PARC    This is a directory containing a lot of papers on Dynamics of Computation Area (Evolution of cooperation) from the XEROX PARC.    ftp://parcftp.xerox.com/pub/dynamics/