Institute for Advanced Studies in Personology & Psychopathology 
Dr. Theodore Millon's theory and psychological assessments, focused mainly on personality disorders.
http://millon.net/Personality Disorders 
Contains the basics, questions, answers, and provides book reviews.
http://personalitydisorders.mentalhelp.net/
Personality Disorders - The Dark Side of Personality 
Diagnostic criteria, links, and resources, with mnemonics for the attributes of specific types.
http://www.personalityresearch.org/pd.html
Online Screening for Personality Disorders 
A 20-question online test for personality disorders by Benjamin J. Sadock, M.D. and Waguih William IsHak, M.D. from the New York University School of Medicine, 1995.
http://www.med.nyu.edu/Psych/screens/pds.html
Personality Disorders Community 
Expert information, support groups, chat transcripts, journals, tests, events, and recommended reading.
http://www.healthyplace.com/Communities/Personality_Disorders/Site/
Monitor on Psychology: Personality Disorders 
Special issue that features a number of articles including treatment for the untreatable, tips for approaching insurance case managers, and Axis II gets short shrift.
http://www.apa.org/monitor/mar04/persontoc.html
International Society for the Study of Personality Disorders (ISSPD) 
Supports scholarship, clinical experience, international collaboration and communication of research including diagnosis, course, and treatment.
http://www.isspd.com/
Open Site: Personality Disorders 
Clinical data, diagnostic criteria, and overview of current research.
http://open-site.org/Health/Conditions_and_Diseases/Psychiatric_Disorders/Personality/
Personality Disorders Foundation Materials 
Presents articles, research, bibliographies, treatment options, advice, and resources.
http://counsellingresource.com/distress/personality-disorders/foundation/index.html
PTypes - Personality Disorders 
Presents diverse perspectives on the concept of personality disorders.
http://www.ptypes.com/overviews.html
eMedicine: Personality Disorders 
Features an introduction, clinical aspects, differentials, workup, treatment, and medications.
http://www.emedicine.com/med/topic3472.htm
Suite 101: Personality Disorders 
Contains a weblog, articles and a discussion area.
http://personalitydisorders.suite101.com/
Personality Disorders 
Find professional and patient information regarding recent trends in treatment.
http://www.health.am/psy/personality-disorders-pro/
Echo 
Personal page that presents the basics of NPD, BPD, and co-dependency. Includes story of how narcissism affected the author's life.
http://www.echo.me.uk
Frequently Asked Questions About Personality Disorders 
Articles about the traits, diagnoses, and treatments of the various types.
http://www.narcissistic-abuse.com/faqpd.html
NPA Personality Theory 
Personality disorders based on genetic traits (Mendelian) of narcissism, perfectionism, schizophrenia, autism and aggression.
http://www.geocities.com/ResearchTriangle/Campus/4847/
Personality Disorder Institute 
PDi in a Nottingham, UK based university. Find the latest news about the work of the facility and events in the field of personality disorders. Includes publications, education, and an email digest.
http://www.pdinstitute.org.uk
DDART and IMPACT 
Management of Personality Disorder Assessment and Recovery Team and Dual Diagnoses Assessment and Response Team are two services in North East London Mental Health Trust for people with a personality disorder. Find details about the teams and a list of disorders and diagnostic criteria.
http://www.nelpd.org.uk