The Psychology Department at Central Washington University has a neat search engine called
Today in the History of Psychology. Simply choose any date throughout the year and click 'Go!' to get a detailed listing of all the significant events in the discipline that occurred on that date. According to the website, "The American Psychological Association Historical Database is a collection of dates and brief descriptions of over 3100 events in the history of psychology. Much of the collection is available in book form as Street, W. R. (1994).
A chronology of noteworthy events in American psychology. Washington, DC: American Psychological Association. This book is no longer in print, and hundreds of more recent entries have been added to the online version."
