Massachusetts Institute of Technology
Mit: Internet Classics Archive: Plato's Apology
Here is one of the finest examples of classical rhetoric, in translation by Benjamin Jowett.
Other
So just.net: Historic Speeches
This site from EdChange.org gives the speeches of many American speakers on various topics related to social justice.
Brigham Young University
Brigham Young University: Forest of Rhetoric
This site is provided for by the Brigham Young University. Almost anything you would want to know about rhetoric and speech is here with great examples and explanations. Intended for a college-level audience, but plenty for younger...