American Rhetoric - Online Speech Bank
Index of 5000+ full text, audio and video (streaming) versions of public speeches, sermons, legal proceedings, lectures, debates, interviews, other recorded media events..." (Note the arrangement is alphabetical by first name.) Speeches by numerous American public figures.
C-Span
The C-SPAN Archives records, indexes, and archives all C-SPAN programming for historical, educational, research, and archival uses.
American Presidency Project
Online resource that has consolidated, coded, and organized into a single searchable database.
TED Talks | TED.com
TED Talks are influential videos from expert speakers on education, business, science, tech and creativity, with subtitles in 100+ languages.