Here's a Manual I created for my organization. It was about 60 pages, but I cut it down to 38. There is also some more information about accessibility available on Microsoft website.

http://www.microsoft.com/enable/training/windowsxp/default.aspx
Also some AT that Microsoft recommends
http://www.microsoft.com/enable/at/default.aspx

Here's one for mac's also

Here's a List of Software we bought for my organization.

CrossScanner
People who has limited physical moblility.

Hey VISTAs,
I’ve been spending some time researching accessible technolgy. Here’s a short list I found. Hope it’s helpful!

Design for Accessibility: A Cultural Administrator's Handbook:
http://www.nasaa-arts.org/publications/design_access.shtml

by Denise Meise

West Tennessee STAR Center

The West Tennessee Special Technology Access Resource Center, better known as the STAR Center, is a non-profit organization in Jackson, Tennessee that specializes in assistive technology. In 1988, Chuck and Margaret Doumitt discovered that their two youngest children were losing their eyesight, and doctors eventually determined that they had a rare condition called Batten’s disease. This disease would cause blindness, seizures, loss of motor skills, and ultimately death. Chuck and Margaret began to dream that George and Angela would someday have access to assistive technology. Instead of moving to a larger city that already had an assistive technology center, the Doumitts decided to start one on their own.