Talking Tutor
From: NASA Tech Briefs Insider - 02/28/2006

In the 1990s, Exceptional Teaching Inc. developed the Speech Assisted
Learning (SAL) device that provided math and Braille reading lessons in a
flat, notebook-sized tool. The same math problems that appear in textbooks
were presented in Braille, and unknown words and symbols were pronounced with
a press on the paper. 

With National Science Foundation funding, Exceptional Teaching and Touch
Graphics Inc. have collaborated to re-introduce SAL2, part of the Talking
Tactile Tablet (TTT). The system uses more powerful software to allow blind
students and adults to work with a tutor or alone on math problems,
geography, or even solving crossword puzzles. 

Links:
Electronic Braille Tutor Teaches Independence
http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=105832&org=NSF&from=news
http://www.newswise.com/articles/view/518100/

Exceptional Teaching Inc.
http://store.exceptionalteaching.net/

Touch Graphics
http://www.touchgraphics.com/

SAL2
http://www.touchgraphics.com/sal2.htm