How can I tell a great speaker?

Well, I am guessing we might not all agree on what makes a great speaker. But I doubt anyone would vote against Majora Carter, speaking here at Technology Entertainment Design's conference in February 2006. After you've seen the talk, or maybe before, read Guy Kawasaki's deconstruction of the talk that describes why he thinks she's so effective. One way to learn is by using the example of other effective speakers. I think she's pretty inspiring.