Taryn Simon is featured in a lecture she gave this past summer on TED.com. Simon is a large format, documentary photographer. The talk focuses on two of her projects. The first is called "An American Index of the Hidden and Unfamiliar," which deals with places normally kept hidden from the American public. The other project is "The Innocents," which is a series of portraits of people wrongfully convicted of crimes they didn't do. Simon was recently given the McArthur Award, which is also called the "Genius Award."
Go here to see her talk, which runs about 15 minutes or so. She's a fascinating photographer with a lot to say about the medium.