MLK, Jr.: Beyond Vietnam -- A Time to Break the Silence
Democracy Now! Special: Martin Luther King’s Life and Legacy 40 Years After His Assassination
Here's the full "I've Been to the Mountaintop" speech. Pure brilliance, in every sense.
Update: More from American Rhetoric:
¶ Martin Luther King, Jr. Sermons and Speeches [TXT] [RA]
¶ Martin Luther King, Jr.: "I Have a Dream" [TXT] [RA]