I will be adding more information as time goes on. This topic is of great concern to many, so please check back. I have made "childhood disabilities" a category of its own.

Learning disabilities are covered here.  Subjects include: parenting, legal issues, social issues, self-esteem and many more.
 http://www.ldonline.org/

Government site on benefits for kids with disabilities.  http://www.ssa.gov/kids/parent6.htm

Finding a summer camp for a child with special needs. Camp can be a rewarding experience for a child with special needs. They can meet new friends and build self-confidence. If this sounds like something that would interest your child, this site is a good starting point.
http://kidshealth.org/parent/system/ill/finding_camp_special_needs.html

Childhood Cancer Foundation - The Candlelighters Childhood Cancer Foundation National Office was founded in 1970 by concerned parents of children with cancer. Advocacy, information, support, and more.
http://www.candlelighters.org/

Keepkidshealthy.com is designed as 'a Pediatrician's guide to your children's health and safety.' It is not meant to replace the medical advice that you receive from your doctor. Instead, we hope to supplement the information that you receive from your child's physician, with a special emphasis on better health through preventative care.
KeepKidsHealthy.com

IRSC The IRSC web site is dedicated to children with disabilities and other health related disorders worldwide. Our mission is to improve the lives of these children.
Internet Resources for Special Children

Make-A-Wish Foundation Since 1980, the Make-A-Wish Foundation® has enriched the lives of children with life-threatening medical conditions through its wish-granting work.
Make-A-Wish Foundation.org

Ronald McDonald House The idea behind the Ronald McDonald House program is simple: Provide a "home away from home" for families of seriously ill children receiving treatment at nearby hospitals.
Ronald McDonald House Charity.com

Kidney Corner - a place for information and discussion about kidneys on the Internet. The website serves as the introduction to an active electronic discussion and support group focused on pediatric kidney diseases. They focus on questions and answers, along with connecting people who have been through similar experiences.
Kidney Corner.com

Autism Resources - Autism is a developmental disability which normally appears in the first 4 years of a childs life. Autism is the result of a neurological disorder in the brain and is now said to affect 1 in every 150 children born. "Autism Society of America is dedicated to increasing public awareness about autism and the day-to-day issues faced by individuals with autism, their families and the professionals with whom they interact. The Society and its chapters share a common mission of providing information and education, and supporting research and advocating for programs and services for the autism community".
Autism Society.org

Autism-resources.com has compiled an extensive list of Autism related links and information concerning the disease. Regional chapters of Autism organizations and international chapters are listed on this site.
Autism-resources.com

Variety Clubs International - "A world-wide organization that bills itself as "The Greatest Children's Charity in the World". The aim of the 53 Variety Clubs around the world is to improve the quality of life of children who are less fortunate than others. The members, largely drawn from the world of entertainment, leisure, media and business, work untiringly to assist children who may be sick, handicapped or disadvantaged by social circumstances."
http://www.usvariety.org/index.html

Fragile X syndrome - "(FXS), the most common cause of inherited mental impairment. This impairment can range from learning disabilities to more severe cognitive or intellectual disabilities. (Sometimes referred to as mental retardation.) FXS is the most common known cause of autism or "autistic-like" behaviors. Symptoms also can include characteristic physical and behavioral features and delays in speech and language development."
Fragile X syndrome

National Organization Caring for Kids - "The mission of the National Organization Caring for Kids is to improve the quality of life for special needs children through the use of assistive technology. NOCK is dedicated to providing programs that improve the quality of life of chronically ill kids across America. Currently, NOCK is focusing its services on assistive technology. It is estimated that thousands of children do not receive medically-prescribed equipment such as wheelchairs and AAC devices due to economic barriers."
National Organization Caring for Kids

The Travis Roy Foundation - "The individual grant funds have been used to modify vans and to purchase wheelchairs, computers, ramps, shower chairs, and other adaptive equipment to help paraplegics and quadriplegics live their lives."
The Travis Roy Foundation

National Organization for Rare Disorders - "is a unique federation of individuals and organizations working together to build a better world for people affected by rare diseases."
http://www.rarediseases.org/

The Arc - The Arc of the United States advocates for the rights and full participation of all children and adults with intellectual and developmental disabilities.
http://www.thearc.org

National Anxiety Foundation - Subjects include: obsessive compulsive disorder, panic disorder, terrorism fear.
http://www.lexington-on-line.com/naf.html

Allsup, Inc - lists many disabling conditions and the criteria to be considered disabled.   From AIDS to cancer to stroke the criteria for many conditions can be found here.
  http://www.allsupinc.com/library/criteria_Home.aspx?SessionCode=1000

Myositis information site - myositis is the swelling of muscles due to infection, injury, exercise. This site has information concerning this problem.
 http://www.myositis.org/about_myositis/index.cfm

National Institute Neurological Disorders and Stroke.  Their mission is to reduce the burden of neurological disease.
 http://www.ninds.nih.gov/index.htm

Down Syndrome: Health Issues written by Dr. Len Leshin, M.D.
Contains articles about children with DS. Articles include dealing with: Obstructive Sleep Apnea, Musculoskeletal Disorders and DS, Blood Disorders and DS, plus articles written by guest physicians.
http://www.ds-health.com

Pain Management by the Mayo Clinic - Resources, articles, and self-help resources
http://www.mayoclinic.com/health/pain/

Arthritis Management - Rehabilitation, pain management, exercise and more
http://www.hopkins-arthritis.som.jhmi.edu/mngmnt

National Pain Foundation - An on-line educational and support community for persons in pain, their families and physicians. Your source for treatment options and pain information that is peer reviewed by leading pain specialists.
http://www.painconnection.org/

Medical Information Network - This site is full of good information concerning: chronic pain, fatigue, fibromyalgia, RSD, and more. Very useful site.  http://www2.rpa.net/~lrandall/index.html