James Nachtwey talks on being a documentary photojournalist, and about the the power of documentary photojournalism. He shows his work and discusses the world events he photographed in a superb-quality 24-minute QuickTime video of his acceptance speech for the 2007 TED Prize.
Be patient...it takes time for the QuickTime to load in full.
Courtesy of Rob Galbraith's web site, here's the link.