Books about autism:
The Mislabeled Child by Brock Eide and Fernette Eide
The Complete Guide to Asperger's Syndrome by Tony Atwood (My kid is dx'd with HFA, rather than Asperger's but this was still helpful)
Autism and Asperger Syndrome (Facts) by Simon Baron-Cohen
Books that work on language and social skills:
The Social Skills Picture Book
You are a Social Detective by Michelle Garcia Winner
Superflex by Stephanie Madrigal
100% LIstening from Linguisystems (They have more language exercises at their website: www.linguisystems.com, including tons of stuff for kids with ASD).
Tool kits from Autism Speaks
You might want to take a look at the 100 day tool kit for after the diagnosis for a start.
National Autistic Society (UK)
This is an organization that advocates alternative treatment and biomedical intervention. I research any suggestion that they make very carefully. Their push for chelation is a little scary to me, but their info on supplements, yeast and diet may be helpful. At the same time, I love their hopefulness. Many kids with ASD improve tremendously as they get older and with therapy.
A discussion group that includes a lot of people with ASD. They have a different view of the need for a cure.
Check with universities in your area to see if they have support groups or clinics with services, three in my region do. Two of those are free.
Check to see if there is an Easter Seals chapter in your area that provides services. Some Easter Seals Chapters provide camps or respite weekends.