I have just had the following book very highly recommended to me. Apparently it is very practical and user friendly book, with ideas for building in OT-type exercises across the day.
'Building Bridges through Sensory Integration: Therapy for children with Autism and other Pervasive DEvelopmental Disorders' by Ellen Yak; Paula Aquilla and Shirley Sutton. Published by Sensory Resources £17 Amazon
I haven't got a copy of it myself yet, but know that sensory integration difficulties effect my ds quite significantly.
Hope others find it useful too