There's a feature in the Travel section of tomorrow's _New York Times_ on Ansel Adams and Yosemite, including an interactive slideshow in the online version with narration by Andrea G. Stillman, who was Adams' assistant in the 1970s.
http://travel.nytimes.com/2008/04/27/travel/27journeys.html?ref=travel
http://travel.nytimes.com/2008/04/27/travel/27journeys.html?ref=travel