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FYI - If you couldn't make the presentation on accessibility in March, you can view the recorded presentations over Breeze at http://meeting.psu.edu/node/384
The second goes into depth about video captioning at Rochester Institute of Technlogy while the last was a presentation from David Cunningham, a visually impaired student, about his challenges with acessing course materials.
They're also good examples of live signing and live captioning. The captioning was good, because as John notes, there were some audio glitches in the beginning...