It's called Project Billboard, built by the Center for American Progress (CAP) which is headed by John Podesta, Clinton's chief of staff. Interestingly, the billboard got put in Time Square because of a legal battle between the Center and Clear Channel. CAP sued Clear Channel for "breaking a contract over the posting of an antiwar billboard in Times Square during this month's convention." ("Clock in New York's Times Square Counts War Cost." By Mark McSherry, Reuters, Weds august 25th.) Check out how they came up with their facts and figures.