The Australian Government has produced a short video, Web Accessibility: what does it all mean? The first important point made in the video is that web accessibility is not about disability – web accessibility is about universality.
There is no speech in the video. Instead all the messages are delivered by interesting text. At the end there is a link to more information. There is no speech in the main version, only upbeat background music and poster messages in the video below. You can get speech with the video or you can get an audio only (MP3) version. This is a great example of providing information in different formats where the original design is not universally accessible.