With over 150,000 members, the "APA" is the largest national organization for psychologists. The APA is geared more towards clinical and counseling psychology.
This collection of dates and descriptions of over 3000 events in the history of psychology allows you to pick a date from a calendar and get a list of the important events that happened on that date.
Before the web, there was the Usenet, a gargantuan set of online discussion boards. This is Stanford University's Guide to Usenet discussion groups for psychology.
Interested in visiting a variety of online classes in Psychology? The University of Texas at Austin maintains the World Lecture Hall, a repository of class web sites in a variety of disciplines. Here are the links to their Psychology classes.
