Rita Cacas, ERA Communications Officer at the National Archives and Records Administration, did a presentation on this at the Special Libraries Association Annual Conference in June. Her presentation is available online. In addition, her session was recorded and the audio is also available (1 hour, 27 min.).
The volume of information that they are concerned with is tremendous. For example, in the Department of Defense, annually there are 54 million images from electronic official military personnel files. So ensuring that the digital materials are preserved for the short and long-term is critically important.
Technorati tag: Digital Preservation