Probability: General

• Probability Abstract Service, maintained by Stefano M. Iacus (University of Milan, Italy).
• The Probability Web, maintained by Bob Dobrow (Carleton College, Minnesota)
• Electronic Journal of Probability and Electronic Communications in Probability
• Introduction to Probability by Charles M. Grinstead and J. Laurie Snell: Introductory text online, with simulations and Java applets

Probability: Special Topics

• Monte Carlo Markov Chain Preprint Service (Cambridge, U.K.)
• The Primordial Soup Kitchen: David Griffeath's home page about random cellular automata and other neat stuff (University of Wisconsin)
• Rutgers Statistical Mechanics Meetings (Joel Lebowitz, organizer)