Check out this video put out by the History Channel called:
America the Story of Us: Declaration of Independence
Take out a seperate piece of paper to write notes down on. As you watch the video, write down as many as you can good facts about the Declaration of Independence, and what it did for America.
You may want to watch the video once the whole way through, then re-watch as you write down your facts.
The purpose of this warm up, is to be able to extract good (and shorter) notes from a longer presentation.
http://www.youtube.com/watch?v=yb7MI8NQLoo
Enjoy