I discovered two books which are brilliant if you or someone in your family has just had a diagnosis: 'Asperger's Syndrome: The Essential Guide' and 'Autism: A Parent's Guide', both by HIlary Hawkes. They're both on Amazon.
The person who wrote them also writes kids books and has a website which has a collecton of books aimed at kids who have disabilities/asperger's etc. There are online games and fun stuff aswell as the books. My youngest son, who as AS, loved the one called 'Jay in The Journey' - about a boy who has AS. The site is at www.hilaryhawkes.co.uk/strawberryjam books . Or just google the author's name. Def worth looking at.