Mumsnet is an online network for parents to discuss anything and everything to do with parenting, families, relationships, health, politics, social policy education and much more.
They have a thriving area of their Talk boards for parents of children with special needs, or for parents who themselves have special needs.
The topics include education, legal/financial. children, teen and pre-teens, and parents' recommendations of useful stuff (books, support groups, clothes, aids for living, etc). They also have articles with advice about parentling children with special needs and getting support.