The RADAR Framework can help you remember what kinds of questions you should be asking about an information source as you evaluate it for quality and usefulness in your research.
Relevance
How is the information you have found relevant to your assignment?
Does the information answer our research question?
Authority
Who is the author/ publisher/ source?
What are the author's credentials?
Is the author affiliated to an academic institution or reputable organization?
Date
When was the information published?
Has the information be revised or updated?
Is the publication date important to you?
Does your research requite timely sources?
Accuracy
Where does the information come from?
Is the information supported by evidence or peer reviews?
Is the information presented in a professional or academic manner? Free of spelling or grammatical errors?
Does it have citations and references?
Rationale
Why did the author publish the information?
What is the purpose of the information? to inform? teach? sell? entertain? persuade?
This site contains a database of and index to 5000+ full text, audio and video versions of public speeches, sermons, legal proceedings, lectures, debates, interviews, other recorded media events, and a declaration or two. You can search for a specific speech or check out the 100 Top Speeches.
This Forbes.com article by a communications coach and writer focuses on three specific techniques that the President uses to be an effective speaker. A video is included.
Toastmasters International is a non-profit educational organization that teaches public speaking and leadership skills through a worldwide network of meeting locations. This link will take you to Tips for Public Speaking. There are also additional links to explore on this page.