I found this podcast/blog this morning.
which is a number of podcasts about various issues relating to autism. most interesting to me was the podcast called:
Autism on the Homefront: Parenting Autistics
The casters mention research pointing to research that is uncovering that autism has genetic links.
So things like Chelation Therapy (which is to try to remove heavy metals from the body) probably aren't going to be to affective if autism spectrum disorders aren't caused by environmental issues.