In this presentation, Prof Rosling uses these beautiful animations to disprove some myths and misconceptions about the state of the "Third World countries". What I love about this presentation is the incredible amount of energy that this guy has. He mixes in humor, excitement and drama to capture the attention of the audience. Good stuff :) Check it out here...
Btw, if you are looking for some great speeches and presentations by visionaries, you should check out TED - Technology, Entertainment and Design. It's an annual conference where thinkers and visionaries from around the world come down to share their thoughts. These are some of the TED Talks I found powerful and inspiring:
U2's Bono on Poverty in Africa
Steven Levitt, Author (Freakonomics)
Richard Dawkins, Author (The God Delusion)
Jeff Han, Inventor of Multitouch Technology (a la iPhone)
Al Gore on Global Warming
Majora Carter on community building in the Bronx