Technique
Designing Effective Oral Presentations
Understanding the Speaking/writing Relationship, Questions You Should Ask, Oral Presentations 2 (Designing each segment, Choosing a Delivery Style, Enhancing Audience Comprehension, Using Visual Aids, Practice), and Presenting to a Multicultural Audience.
Scoring Power Points
Provides guidance in making sure that the presentation technique does not  become a goal in itself,  that the presentation enhances and communicates a larger and deeper body of work and thought. Combines the use of presentation software with other forms of communication, writing and reporting to persuade, convince, inform and enlighten.

Collections
American Rhetoric
Database of full text, audio and video (streaming) versions of public speeches, sermons, legal proceedings, lectures, debates, interviews, other recorded media events, and a declaration or two.
Booknotes
The site represents the long-running television show Booknotes.  There are several interesting aspects to the site, but the best is its collection of transcripts dating back to 1989
Collections of Speeches
Extensive text --  and   in some cases --  audio of  speeches. Speeches are grouped by speaker or subject. Areas included are  history, government, politics, foreign policy, and foreign government, as well as speeches of a general nature by famous people.
History and Politics Outloud
Searchable multimedia database documenting and delivering authoritative audio relevant to American history and politics.  Also includes transcripts.
Speeches by Women 
Text-searchable archive of speeches by women. 
World's Famous Orations  (Williams Jennings Bryan/1906)
A timeless collection.