I’m a huge fan of James Nachtwey and you can check out his excellent presentation from TED this year online. The TED website is great because they have all the presentations from the conference online. Edward Burtynksky is also another of my favorite photographers and his presentation from 2005 is also online. They’re both about 30 minutes but well worth viewing. The site has as log of other good content too from luminaries like Phil Borges and Frans Lanting