You may find the following resources, provided by third-parties, useful.  You can see the full list below, or check out the topic-specific lists:

Look & Feel Resources
Websites with information regarding web design. More specifically, find information specifically about Higher Education websites, using color on the web, web typography, and more!
Usability & Accessibility Resources
Learn about how to make websites more accessible to any visitor.

Full List

Web accessibility for cognitive disabilities and learning difficulties
http://dev.opera.com/articles/view/cognitive-disability-learning-difficulty/

Opera "covers a few of the problems users with cognitive disabilities may have that can affect their ability to use the Web, as well as the things that developers can do to alleviate these problems and things they should avoid."