My son is only 5 and not diagnosed, but I've seen some signs and am keeping it in the back of my head.

One thing that really interests him are non-fiction books that you don't necessarily have to read cover-to-cover. I can't think of a particular series, and some are harder than others, but the kind I'm thinking of will have 2-6 page spreads on a particular topic. Then, even the topics themselves are broken up into small snippets. So a picture might catch your eye, and you could read about it, but you wouldn't have to have read what came before it to understand it. Does that make sense.

Ah...one series came to mind. "You Wouldn't Want to (Be on the Mayflower/Be a Mummy/etc.)"