Presentation Zen: Storytelling lessons from Bill Cosby
presentationzen.com
presentationzen.com
On another note, the Presentation Zen blogger and author, Garr Reynolds, was a professor in a course I took a few years ago. Although the class he was teaching at the time had nothing to do with giving presentations or speeches, he was so passionate about the topic that peripherally* I ended up learning more about giving great presentations from his class than any other class I've ever had (including Speech in college). His blog is a great source for improving too.
*The topic constantly came up and Garr constantly organized related events outside of class