Canadian sites:

Autism Society Ontario
Autism Spectrum Disorders Canadian-American Research Consortium
BBB Autism Support Network/Autism Society York Region
Canadian Autism Intervention Research Network
Children's Mental Health Ontario
Kerry's Place Autism Services
The Geneva Centre for Autism

Other sites:

Autism Resources
Autism/PDD Resources Network
Autism Society of America
Cure Autism Now
National Institute of Mental Health
Speech Therapy & Autism Resources