This site provides free audiobooks from the public domain.
Free MP3 versions of Abraham Lincoln‘s Gettysburg Address (read by Jeff Daniels, Sam Waterston and Johnny Cash), also Speeches by Winston Churchill (Blood,Toil, Sweat & Tears, We Shall Fight on the Beaches), and F.D Roosevelt (Date That Will Live in Infamy – Declaration of War on Japan)
Free MP3 versions of 100 great American Speeches. Contains speeches by JFK (Inaugural Address, Civil Rights Address), Martin Luther King, Malcom X, Dwight D. Eisenhower (Farewell Address), Harry S. Truman (Truman Doctrine) and Ronald Reagan.
Large collection of international speeches, sound bites and music from politics to movies.
Great speeches section of History Channel’s history.com