zeroality, don't make such an assumption- we're interested in and view pretty much any website you might.
As to the general of the topic, Deaf users could experience inaccessible content in many forms. Not captioning sound would be a clear one. If much of your sites audience is Deaf or HOH viewers, including videos in the local sign language could also be a valuable tool to web access, for those who English is not their first language. That's pretty much all I can think of.
