A wonderful new resource from the W3C is a set of very short videos called Web Accessibility Perspectives. The videos take a particular aspect of web accessibility such as keyboard compatibility or clear layout and design and show how they are essential for people with disabilities and useful for everyone.
I picked one at random, the text to speech one, to share here. There are 10 videos in all. They are perfect for use in a class about accessibility or just for learning something about web accessibility if you’re trying to understand it yourself.