American Association of Homes and Services for the Aging
http://www.aahsa.org

HUD USER
http://www.huduser.org/

American Association of Housing Educators
http://www.extension.iastate.edu/pages/housing/aahe-links.html

Corporation for Supportive Housing
http://www.csh.org

Intentional Communities
http://www.ic.org

National AIDS Housing Coalition
http://www.nationalaidshousing.org/

Supportive Housing Network of New York
http://www.shnny.org