Depression and Bipolar Support Alliance
Directory of local support groups. Also offers a real-time online support group for individuals and a parent online support community.

National Alliance on Mental Illness
Online directory and registration for NAMI recovery support groups offered nationwide. Also offers a directory of family support groups. 

Recovery International
Support through peer-led meetings using a cognitive-behavioral framework.  Offered though local meetings in communities in the U.S., Canada and Ireland.  Also offers regularly scheduled telephone meetings, online meetings and chat meetings.

Schizophrenia and Related Disorders Alliance of America
Online directory of local peer-led support groups.  Also offers multiple weekly conference call groups for diagnosed individuals and family and friends.