Guy Barker offers tips and software for people with disabilities using a Tablet PC. He gives priority to ways that may not be so well suited to other computers.
Check out Tablet PC Speech Assistant, Ink to Speech, Improve Handwriting, and cartoon accessibility. He’s open to suggestions for other programs you think will be useful.
Great site for people with disabilities. Also, Barker and other mobile PC software developers offer products that may assist with accessibility on TabletPCPost.