Another librarian asked for a collection of speeches to use as examples for students. A co-worker of mine recommended these sites that are free to the public.
American Rhetoric – Michael E. Eidenmuller from the University of Texas has gathered a collection of speech audio and video from U.S. history.
Presidential Speech Archive – The University of Virginia organized these by sections of U.S. history.
Recorded Sound Reference Center – This is the Library of Congress’s collection of audio.