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Web accessibility guidelines and World Wide Access
In their excellent video, "World Wide Access", created by DO-IT at the University of Washington gives an instructive overview of accessibility. Though the focus is on web accessibility, the video provides a good technical introduction to key concepts, shows how users benefit from accessible media, how their assistive technologies interact with web resources, and mentions ways developers and content creators can work to create online experiences that reach all users, regardless of ability.
It structures the conversation on accessibility around the World Wide Web Consortium's Web Content Accessibility Guidelines 2.0 (WCAG 2.0) and its four principles of web accessibility, POUR:
Perceivable: "Information and user interface components must be presentable to users in ways they can perceive."
Operable: "User interface components and navigation must be operable."
Understandable: "Information and the operation of user interfaces must be understandable."
Robust: "Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies."