Megan and Barbara,
Minnesota Historical Society has a few EAD examples for AV material -- although none of the film, video or sound recordings are yet available as linked digital surrogates. We just started making finding aids to the sound and visual collections this past year but have completed about 28 so far.
http://www.mnhs.org/library/findaids/sv000017.xml: the same sound recordings in master, digital submaster, and digital user formats.
http://www.mnhs.org/library/findaids/sv000010.xml: primarily a collection of video recordings, but includes some photographs with a finding aid link into our visual resources database.
You can view the EAD encoding through your browser source view.
We'd be happy to hear any comments, suggestions you have about our encoding or description.
Monica Manny Ralston
Archival Processing Manager
Minnesota Historical Society