In August Donna Williams sent round something to her mailing group about the difference between high and low functioning autism. I emailed her earlier to ask if I could share it publically. She's replied to say that she's edited it and out it on her blog here The bit she sent round was the second one - in response to Adam Feinstein's question.
I think it's really interesting and when I read it last summer it put into words what I had been thinking for some time.
It seems relevant to a few threads running at the moment which is why I've given it one of its own