Craig Mills and his colleagues from CALL Scotland have written and published an iPad book to support learners and users with additional support needs: iPads for Communication, Access, Literacy and Learning (iCALL).
The book is free to download as a pdf file from CALL Scotland or you can buy a paper copy for a very reasonable £7.50. The book includes chapters on:
Getting to grips with the iPad.
Apps to support teaching & learning.
iPad in Assessments and Exams.
Managing & Implementing the iPad.
Glossary of Terms.
iPad Management using iTunes: some useful tips.