Here is a new Toshiba Android 3.1 tablet that seems worth taking a look at.
Engadget also had a nice review of it too–>http://www.engadget.com/2011/06/07/toshiba-thrive-hands-on/
At this price it seems very much worth the money. I hope that more special needs Android applications start popping up.
One that I am aware of that seems nice is www.discovermyvoice.com a nice aac application.