Amongst your user base you are very likely to have students and staff with hearing, sight, or reading disabilities. Although accessibility has taken huge leaps in the last few years, there's plenty of other work still going on.
We have just announced the public beta for two add-ins that help make Office documents more accessible: STAMP and DAISY:
STAMP, the Subtitling Add-In for Microsoft PowerPoint, lets you add closed captions to the video and audio files in your PowerPoint presentations, so no one misses a word of what you have to say.
Save as DAISY for Office 2010 helps you convert Word Open XML files to the Digital Accessible Information System (DAISY) format. DAISY powers digital talking books and compatible software and Braille readers for people with print disabilities or limited vision. This beta supports Office 2003, 2007 and 2010.
Read more on the Microsoft Office blog