The Agency for Healthcare Research and Quality has just published,
"Accessible Health Information Technology (IT) for Populations with
Limited Literacy: A Guide for Developers and Purchasers of Health IT."
See the below description and URL. 
As most health information technology (IT) developers have little
knowledge of populations with limited literacy and of the technical
standards and aspects of accessible health IT design, this guide and
checklist provide a structure, strategies, and other resources for the
development of these technologies. Similarly, purchasers of health IT
(e.g., heath plans, pharmaceutical companies, foundations, and other
non-profit organizations) that desire to make technologies available to
limited-literacy adults, can use this guide and checklist to evaluate a
health IT product. For those purchasers who contract out the development
of their product, this guide can be used to direct and validate the
developer's work. 

http://healthit.ahrq.gov/portal/server.pt?open=514&objID=5554&mode=2&hol
derDisplayURL=http://prodportallb.ahrq.gov:7087/publishedcontent/publish
/communities/k_o/knowledge_library/features_archive/features/accessible_
health_information_technology__it__for_populations_with_limited_literacy
__a_guide_for_developers_and_purchasers_of_health_it.html
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