Where to start
FLITE has a number of choices for those times when Wikipedia just won't cut it as you learn more about your topic.
Calsidyrose. (2010). Compass Study [photo]. CC. Retrieved from
You can look in CREDO Reference, which covers a little bit of everything (including psychology).
Or, you can check FLITE's catalog for psychology encyclopedias. Some are in print, but others are online!
Some useful websites
Covers everything from autism to shyness to race--and a great deal more!
Mental Health Topics
From the U.S. Substance Abuse and Mental Health Services Administration. Includes reports and prevalence of disorders by state.
The website of the National Institute of Mental Health features information on a variety of mental health topics.