Ahmed Bagi
Manchester This is not directly related to your question but may open some new venues/starting points to your research.
The first link is to: http://www.abilitynet.org.uk/content/home.htm
skillsheets: http://www.abilitynet.org.uk/content/factsheets/Skillsheets.htm
for instance: http://www.abilitynet.org.uk/content/factsheets/pdfs/Using%20Autocorrect.pdf is a good worksheet for using Autocorrect in Word (XP).
another useful contact is: http://www.abilitymagazine.org.uk/ The Disability Magazine. They do have some very interesting articles which could indirectly lead you to a more intensive research work in the areas of teaching development.
http://www.abilitymagazine.org.uk/features/2003/01/A47_Page_18-19_UK_Online%20.pdf is an article dedicated to online learning for disabled people (in computing).
I have taken the liberty in redirecting your query to Geoff Busby at the BCS Disability Group. As soon as I hear from him I will forward his findings to you. His email address is: disability.grp@bcs.org.uk and the web site is: http://www1.bcs.org.uk/homepages/361/
Also, The School of Social Sciences, Glasgow Caledonian University has some useful researches in your area of concerns. Please look at: Are disabled students set to lose out in the digital revolution? http://www.connections.gcal.ac.uk/JimsGuid/AccessToEducation.html
The Joint Information Systems Committee (JISC) http://www.jisc.ac.uk/ is an extremely useful resource in " providing strategic guidance, advice and opportunities to use Information and Communications Technology (ICT) to support teaching, learning, research and administration". Their SiteWide Search facility is quite fruitful.