Psych's On The Net 
A website for mental health professionals to come and chat, relax, and interact with peers.
http://www.geocities.com/GeorginaPsych/Behavior OnLine 
The gathering place for mental health professionals. Forums and Chat Events on a wide range of topics, chaired by leading contributors to the field.
http://www.behavior.net
The Therapeutic Milieu 
Online community for mental health professionals working with at-risk youth and emotionally disturbed children in residential treatment.
http://www.therapeuticmilieu.org
Behavior OnLine Chat Events 
Topics of interest to mental health professionals. In each chat, editor John Suler leads a discussion of invited panelists followed by open discussion.
http://behavior.net/chatevents/index.html
Australian and New Zealand Mental Health Consultation Liaison Nurse Network 
Links peers for an exchange of information and ideas, with a view to improving communication and support. Email group aimed at independent practitioners.
http://groups.yahoo.com/group/AandNZConsultationLiaisonNurses/
Postmodern Therapies (PMTH) 
PMTH stands for "Postmodern Therapies." It is a list intended primarily for therapists, graduate students, and scholars with a special interest in psychotherapy.
http://www.california.com/~rathbone/pmth.htm
Suicidology E-Group 
A moderated research information network that facilitates the rapid dissemination of research information and news relevant to the study of the suicidal phenomena. It is specially dedicated to mental health professionals, but also to all the medical community and other people interested in suicide research and prevention.
http://groups.yahoo.com/group/Suicidology
Roadmind 
Features a forum for international discussion of mental health.
http://www.roadmind.com