The Center for the Enhancement of Learning and Teaching (CELT) integrates best practices in making learning accessible to all learners, approaching accessibility as "universal design for learning." For example, web accessibility principles are incorporated into the Model Syllabi (Word) and into the IPFW Online Course Design Standards (PDF).
This Learner-Centered Design Library Guide page was designed to support a Fort Wayne Teaching Conference diversity theme. Ludwika Goodson, CELT; and Kathleen Surface, IT Services, developed it. It contains a wealth of information and examples of best practices, how to make your documents and Powerpoints accessible, along with local and national resources and standards.
The principles of Universal Design for Learning (UDL) apply to classroom, blended, and online courses. Here is a short paper that defines UDL and provides examples of how to implement it from the University of Washington's DO-IT project.