First Signs (identifying early signs of autism spectrum disorders): http://www.firstsigns.org/

CDC Act Early for Autism: http://www.cdc.gov/ncbddd/actearly/index.html

Autism Consortium (has many resources for autism spectrum disorders; click "resource database" to search for providers/therapies by area of MA) http://www.autismconsortium.org/

Federation for Children with Special Needs (based in Boston):  http://fcsn.org/

A Parent's Guide to Special Education (a very helpful resource for special education and IEP planning): http://www.fcsn.org/parentguide/pguide1.html

Nonverbal Learning Disorder: http://nldontheweb.org/

Attention Deficit/Hyperactivity Disorder (ADHD): http://www.chadd.org/

Learning Disabilities http://www.ncld.org/