APA PsycInfo (PsycINFO)
Contains citations and summaries of scholarly journal articles, book chapters, books, and dissertations, all in psychology and related disciplines.
ProQuest Psychology Journals
Encompasses a wide range of topics from leading psychology and psychosomatic publications.
Psychology and Behavioral Sciences Collection 
A comprehensive database covering information concerning topics in emotional and behavioral characteristics, psychiatry & psychology, mental processes, anthropology, and observational & experimental methods.
Provides numerous psychology resources including forums for mental health professionals, information on specific disorders, a prescription drug reference guide, a list of news headlines and much more.
National Institute of Mental Health  
Includes a wealth of information on NIMH and related research programs, mental health statistics and listings of publications, clinical trails, treatment and news related to specific health topics.
American Psychological Association (APA) 
Based in Washington, DC, the APA is a scientific and professional organization that represents psychology in the United States. With 150,000 members, APA is the largest association of psychologists worldwide.