Sunday's Washington Post had another special section on the 150th anniversary of the Civil War. The section included an advertisement for a new showing of the Liljenquist Family Collection of Civil War photos at the Library of Congress and updated set of photos. You can view the photos on the LOC website.
Last month NPR had a story on the identification of a soldier in one of the photos. See "Confederate Soldier In Famous Portrait Is Identified", NPR, 22 August 2012.
If you're interested in Civil War photography, or possibly descended from one of those photographed, check it out.