The Usenet news hierarchy soc.support.depression provides a number of electronic support groups for people suffering depression or in other crisis situations. A number of electronic self-help groups exist under the alt.support hierarchy addressing various problems that can contribute to people feeling suicidal, and providing information about other resources. Note that not all sites carry alt groups. The suicide-support mailing list provides an electronic support group where people can discuss suicidal feelings, thoughts, intentions or previous attempts in a safe, emotionally supportive environment. List members who offer support do so in their spare time on an ad-hoc basis, and come from a diverse variety of backgrounds and experiences.
Discussion revolves around mutual grief support and suicide survivor issues.
Communications appropriate for this list include but are not limited to exchanges of theoretical views and research activities, as well as information on clinical interventions, prevention strategies, and social and political developments pertaining to the reduction of suicide and suicide-related behaviors. Most major cities have a number of local crisis counselling or referral services, many of which are available 24 hours. This page is probably the best list of your local resources you'll find. Lifeline is a 24 hour telephone crisis counselling service with 38 centres nation-wide. Lifeline handles problems such as suicide, depression, loneliness, relationship problems, drug and alcohol abuse, and so on in a caring, supporting, non-interventionist manner.