Professional Organizations:
College of Psychologists of Ontario
Ontario Psychological Association
Creative Bound Publications
Ontario Association of Speech-Language Pathologists and Audiologists 
Ontario College of Teachers
 

Learning Disabilities:
Learning Disabilities Association of Ontario

Nonverbal learning disabilities
NLD Networking Group of Ontario
NLD on the Web

Attention Deficit Disorder
CHADD (Children and Adults with Attention-Deficit/Hyperactivity Disorder)
CH.A.D.D. Canada
The Centre for ADHD/ADD Advocacy, Canada (CADDAC)

Math Help
APlusMath.com

Learning activities for children
BrainPop