American Pain Society (APS)
http://www.ampainsoc.org/
Offers resources for health professionals serving people in pain.

Pain.com
http://www.Pain.com/
Provides information on pain management for multidisciplinary professionals.

Pain Foundation
http://www.painfoundation.org/
Provides information. Advocacy, and support for clients, families. and health care professionals

University of Iowa College of Nursing
http://www.nursing.uiowa.edu/
Find the International Center for the Control of Pain in Children and Adults at this site.