This is the website of the National Autistic Society’s Think Differently campaign which inspired the founding of cAsA. It has the full text of the "I Exist" report and much useful information for journalists.
This is the main website of the National Autistic Society. It contains a huge amount of good quality information for autistics, parents, carers, journalists and professionals.
Research Autism is probably the best source for high quality autism information on the web for professionals and parents.
Aspie Village is a forum for autistics to meet and share information and advice.
Umbrella Autism started life as the Cambridgeshire branch of the national autistic society, and has developed into an invaluable source of local support, information and advice
Autism Hub is a collection of links to blogs written by autistics, parents and professionals in the field of autism.