This Day in History
Lists important historical event.  Can search by a specific date.
Remember.org -- Holocaust Information 
Spanning text, graphics, interactive maps, sound files, poetry, painting; collecting many perspectives on these events; and emphasizing personal remembrance. Includes an abundance of links to other sources.
Presidential Portraits
Selection of portraits featuring U.S. presidents, first ladies, historical buildings, Congressional photos, and documents from 1789 to the present. Keyword searchable and browsable.
Persius Digital Library
An interactive multimedia digital library of resources for studying the ancient world.  Includes ancient texts and translations, maps, illustrated art catalogs, etc. Covers primarily Greek & Roman materials, Latin, and links to other classics related sites.
Chronology of U.S. Historical Documents
Everything from the Bill of Rights to Martin Luther King's "I have a dream" speech.