Through September 24 the University Library System is trying out the database "Oxford Dictionary of National Biography Online." Of course the "national" refers to Britain, not the US, but still. It features "the people who shaped the history of the British Isles and beyond, from the earliest times to the end of the year 2000." The database contains, according to its website, 57,348 biographies and 10,671 illustration. Also 65 million words.
State-of-the-art search options, extensive internal cross-referencing, access to articles from the original DNB, and navigation by "themes" combine with rigorous research and scholarship to make the Oxford DNB one of the most innovative and important reference sites available online.