"American Rhetoric [provides] one easy-to-use, searchable reference database for all ages. According to the website, the online speech bank is an index to and growing database of 5000+ full text, audio and video (streaming) versions of public speeches, sermons, legal proceedings, lectures, debates, interviews and other recorded media events.
While mostly American in content, and with advertising sprinkled liberally across the pages, it is nonetheless a good source of historical audio and text material. (There are also some international speakers represented: Blair, Gandhi, Harper, Queen Elizabeth, Benjamin Netanyahu, etc)
Rhetorical Figures in Sound is a compendium of 200+ brief audio (mp3) clips illustrating 40 different figures of speech.