The Open Access movement encompasses a number of initiatives that encourage more affordable course materials for students, shared resources among teachers, and collaboration among scholars. Here are some simple ways of contributing to Open Access in your research and teaching practices.
This article focuses on the digital literacy gains from wikipedia assignments, and they can help improve the quality of materials available on the web.
What are some basic steps you can take to make sure your course material is equally accessible to all students? Michigan State University provides a good basic checklist.