"Bringing to life some of the Library's most exciting and historically significant materials through Webcasts offering the personal insights of the staff who know them best--and online conversations in which you are invited to join"
http://www.loc.gov/rr/program/journey/

These webcasts could be a great introduction to a unit of study. I especially like the webcast transcript!

For example:
Ann Hoog on Pearl Harbor Oral Histories, Library of Congress, American Folklife Center webcast gives students access to a couple man on street interviews after Pearl Harbor ( which are amazing resources) and gives insight on how historians gather information. A great way to introduce Pearl Harbor , especially if student is expected to do their own research.