The EDI Touch is a tablet created specifically for children with Dyslexia. It runs Android, and the default font is OpenDyslexic. It’s 9.7″ and is in an aspect ratio that matches books children are used to carrying around. It’s currently in beta testing, but here’s a video that shows it in action (Italian).
More Information/Get it: http://tabletascuola.net/editouch/