Center for the Study of Autism
http://www.autism.org/contents.html
Collection of articles on many aspects of Autism

Autism Society of America
http://www.autism-society.org/

Autism Resources Links
http://www.autism-resources.com/links.html
Autism and Autism Spectrum Disorders (ASDs)
National Institutes of Health
http://www.nichd.nih.gov/health/topics/autism_and_autism_spectrum_disorders.cfm

Autism Spectrum Disorder Overview Centers for Disease Control
http://www.cdc.gov/ncbddd/autism/overview.htm

Indiana Resource Center for Autism
http://www.iidc.indiana.edu/irca/ftrainpapers.html
These articles provide thoughtful discussions and practical recommendations on a wide range of topics, including behavior, sensory programming, education, communication, and other issues.