Autism Asperger Publishing Company specializes in books and multi-media on autism spectrum disorders (ASD).  It has published several picture books including All About My Brother (2002) by Sarah Peralta, the 8-year-old sister of a 7-year-old boy with Autism (today they are 18 and 17), Oliver Onion (2004) about an onion who wants to be an orange but eventually learns to accept and appreciate himself as an onion, and A is for Autism F is for Friend (2007), a firsthand account of what it's like to try to fit in when you have autism. These books can be used in families, classrooms, therapy groups and many other places and contexts. Check out the website:
http://www.aapcpublishing.net/

Another great resource is Future Horizons Inc., a company and website specializing in products that educate about Autism.  It also offers several picture books on the topic of autism for use in classrooms or families. One of my favorites is Sometimes My Brother by Angie Healy (2005). Here is the website:  http://store.fhautism.com/c-187-Childrens-Books.aspx