I found this great App for non-verball - AAC - special needs - Speech Button
I am amazed by how the Ipad can really help this area of education and how the students respond - if you are dealing with AAC in your everyday life - you should check this out...belo is what I copied from the web on it and I included the links I found
Speech Button a new Application (App) available in iTunes. Speech Button is
an augmentative and alternative communication (AAC) app for children and adults who are non-verbal or who have difficulty speaking.
App Store - Speech Button