I came across this video today on YouTube.  PJ Kim took first place in the Harvard Business School's Public Speaking Contest in 2006.  He deserved it.
 

PJ models some important elements of public speaking:

1. A compelling opening hook
2. Humor
3. Movement
4. Authenticity
5. Storytelling
6. Metaphor (parallels dating and job hunting)
7. Vulnerability
8. Props
9. A simple structure (3 points)

The video's been edited into 3 pieces.  Enjoy!

Part 1