Back in early 1990s, I volunteered for a year at our local
  Cerebral Palsy center. One of the things I did was learn and
  then fit all of the computers with assistive technologies.
  Special keyboard buttons, straw interfaces (similar to hawking's
  old straw interface), image boards, all kinds of alternative
  devices,depending on the abilities of the users, who were all
  kids under 21.

  I'd learn the device, get it to work (there was no USB, so it
  was a little tricker), teach the teachers, and ALSO teach the
  kids how to use them, until the teachers were proficient enough
  to take over.

  So it was pretty cool. I've been waiting for a decent webcam
  "notice slight movement change" to control computer for a long
  time, and the one he uses is a good one. I'm downloading it now
  to see what it can do. I've always been fascinated by alt-input
  methods, likely because of my experiences... and because I was
  diagnosed with cerebral palsy and was helped by that same center
  up to the age of 5, allowing me to enter school regularly
  without any signs of it.

  So even though they talk about this for ALS sufferers, I see it
  as a great free alternative to the VERY EXPENSIVE stuff they
  have for various disability centers.

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