I have spent several years volunteering, working and lobbying at the Massachusetts State House for people with special needs and mental health problems. Autism being one of the bigger issues. Some of the most amazing people (and difficult work) I have ever encountered.
Maybe this belongs in the documentry thread but I would really recommend the movie "How's Your News?" It was produced by South Park's own Parker and Stone and one of the people in the film was the basis for TIMMY!
http://www.imdb.com/title/tt0298917/
A Documentary chronicling the travels of a team of reporters and crew across America in a hand painted RV. Each of the reporters have a disability ranging from Down's Syndrome to spastic cerebal palsy and their own style for gathering news. The basic approach is "man on the street" reporting and the interactions are sometimes hysterical, sometimes confusing but always honest.