I know this is after MLK day, but I though it worth posting anyway. I read Garr Reynold’s blog on presentation design regularly; he chose to highlight one of the greatest speeches of our time on his blog - Martin Luther King, Jr.’s “I Have A Dream”. This is a longish video, but if you have 17 minutes, watch it (at least the last three if time is short). Read more from the article, and watch the speech; I don’t think I’ve ever seen it in its entirety.
