Robert Darnton in the New York Review of Books:
Can we create a National Digital Library? That is, a comprehensive library of digitized books that will be easily accessible to the general public. Simple as it sounds, the question is extraordinarily complex. It involves issues that concern the nature of the library to be built, the technological difficulties of designing it, the legal obstacles to getting it off the ground, the financial costs of constructing and maintaining it, and the political problems of mobilizing support for it.
Despite the complexities, the fundamental idea of a National Digital Library (or NDL) is, at its core, straightforward. The NDL would make the cultural patrimony of this country freely available to all of its citizens. It would be the digital equivalent of the Library of Congress, but instead of being confined to Capitol Hill, it would exist everywhere, bringing millions of books and other digitized material within clicking distance of public libraries, high schools, junior colleges, universities, retirement communities, and any person with access to the Internet.