The Columbia University Center for Oral History (CCOH) archive holds more than 8,000 interviews, in audio, video and text formats, on a wide varitey of subjects.
National Archives and Records holds many oral history transcripts and audio files including the Nixon Tapes, the Senate Oral History Project and others.
Louie B. Nunn Center for Oral History (University of Kentucky Libraries) home to the Appalachia Oral History Collection among others.
Speak 4 Peace an oral-history project that collects interviews with conscientious objectors across the U.S.
GandhiServe Foundation while not an oral history collection there are film strips of Gandhi some with sound.
The Smithsonian has several collections of oral history at various of its museums.