Check out this wonderful article from the New York Times about the therapeutic uses of the iPad for individuals with disabilities.
The uses include using text-to-speech applications to give patients a voice. Allowing Christopher Bulger, a 16-year-old from Chicago who injured his spine in a car accident, to surf the Internet during the early stages of his rehabilitation when his hands were clenched into fists. As well as giving children with autism applications to learn basic skills, like brushing teeth and communicating better.