There are numerous support groups available for parents and families of children with autism. Some of the groups that I have had the most experience with are the following organizations.
Autism Society of America:
Main website: http://www.autism-society.org/
Local groups: http://188.8.131.52/search_site/chapter_map.cfm
Families for Early Autism Treatment (FEAT):
Main website: http://www.feat.org/
Local groups: on the main website, scroll down on the left side of the page, and look under the heading "Other FEAT websites."
Main website: http://www.autismspeaks.org/
State resources: http://www.autismspeaks.org/community/chapters/index.php
Yahoo Groups (find an online support group): http://groups.yahoo.com/
Autism and PDD Support Network (a very active online support group): http://www.autism-pdd.net/forum/default.asp
Another way to find a local support group is to do an online search (such as with Google or Yahoo) for "autism support group YOUR LOCATION."