Cincinnati Children's Hospital Medical Center: Summer Camps for Kids with Special Needs 
The Hospital Medical Center recommends various summer camps for kids with special needs.
http://www.cincinnatichildrens.org/visit/support/camps/Therapy/Respite Camps for Kids 
Guide to camps that focus on therapy for children with special needs and/or respite for the children and their families. Grouped by country and region, with links to many of the camps' websites.
http://wmoore.net/therapy.html
American Camping Association: Finding a Camp 
Searchable database of ACA accredited camps in the United States and Puerto Rico that offer special needs programming.
http://find.acacamps.org/finding_special_needs.php
Alternative Summer Camps 
Therapeutic wilderness experiences for adolescents, pre-teens, and adults. Descriptions and links for a variety of programs in different states.
http://www.alternativesummercamps.com/