Typing on touch devices for the visually impaired and the blind

I would love to have a discussion on the new concept apps and UIs for the blind at http://12bubbles.com/2012/02/19/touch-and-type-interfaces-for-the-blind/

The link above has 4 different concept UIs [videos] to enable braille typing on touch devices (Including ones developed by researchers at Stanford University, Georgia Tech and independent designers including myself).