Here are links to other World Wide Web sites of interest to historians.

Center for Academic Integrity

Consortium of Humanities Centers and Institutes

National Endowment for the Humanities

Artistic, architectural and archaeological sources (don't forget, these can be "primary" for historians, too)

African art (objects used in Central and West African divination rituals)

Detroit Institute of the Arts (artwork from all historical periods)

Archnet (virtual library of archaeology)

Auguste Rodin (site devoted to the life and works of this French artist, who lived between 1840 and 1917)

Documentary sources and other libraries:

BEGIN HERE: Index of Resources for Historians (University of Kansas)

OR, HERE: Primary Sources (University of Idaho links to sources)

Africa, colonial era (diaries, letters, photographs from nineteenth and twentieth century missionary activities); see also the archives of the
      Billy Graham Center at Wheaton College, Illinois.

African Studies

American broadcasting (sources on the history of the American broadcasting industry)

American cultural/social history (virtual classroom and links to on-line sources, if you scroll to the bottom of the page)

American Memory Documents (documents, photographs, etc. for the National Digital Library)

American Revolution--documents

Ancient Mediterranean history (interactive maps with historical and cultural information/sources)

Argos (limited area search engine for ancient and medieval history)

Beowulf (electronic facsimile project)

Bollandists (Christian hagiography)

British newspaper cartoons (images and analysis of cartoons printed 1904-1957)

Carrie (a full-text electronic library...play around here...try the "Electronic texts and proiimary sources", "Humanities texts and hournals", "History documents at the English server", and "Hanover historical texts project" links)
    ...see also a collection of on-line books.  Carefully searched, this one too can provide primary sources for historical research.

Catholic/Counter-Reformation (full texts in translation)

Census information, United States (U.S. Census data, 1790-1970, as well as historical background section on collection of census in U.S.)

Cherokee Nation

The Great Chicago Fire

Classical texts (400 Greek and Latin texts in translation, with links to other sources)

Cold War International History Project (includes on-line archival materials)

Columbus and the Age of Discovery

Duke University Special Collections Library

Early-modern England (early-modern English primary sources)

Early-modern history, bibliography (database for bibliographical references)

Edsitement: Humanities on the web (good links to additional sources)

Edward the Confessor (an illuminated, mid-thirteenth century manuscript [c.1250] on the life of Edward the Confessor [1042-1066])

Egypt, New Kingdom sources (Book of the Dead, tomb maps, images)

Egypt, Tutankhamen (on-line exhibit of materials related to the 1923 tomb discovery)

European history documents (Brigham Young University on-line documents, edieval preiod--present)

FBI Freedom of Information Act Electronic Reading Room (declassified documents on a variety of topics)

Freedmen/Southern Society Project, University of Maryland (documents, narratives on slavery and Civil War, chronology of emancipation)

The Galileo Project (great primary and secondary material on Galileo and his life/career)

Georgia (texts and images covering the history of northern Georgia during the American Revolution, the Civil War, and the Reconstruction era)

Hanover College, Texts/Documents (broad range of primary sources, covering most all periods and geographical regions)

Heinz Archives (online collection of some congressional papers of H. John Heinz III [1938-1991], a member of the House of Representatives and of the U.S. Senate, from Pennsylvania)

Hippias (limited area search engine for materials on philosophy)

Historic New Orleans Collection

History of education (site maintained by the University of Nijmegen, Netherlands)

Holocaust (Simon Wiesenthal Center's Museum of Tolerance: sources on Holocaust and World War II, including text files, photographs, timelines, biographies)

How the other half lives (hypertext version of the 1890 classic by Jacob Riis)

Indian Affairs (laws, treaties, etc.)

Institute and Museum of the History of Science (museum in Florence, Italy, includes on-line exhibitions)

Italian studies resource guide (archives, newspapers, etc.)

Italy: twentieth-century photographs

Jacobs, Harriet (site includes her narrative of slavery, entitled Incidents in the life of a slave girl)

Jesuits and the Sciences, 1540-1995

Journal of Southern Religion (on-line version of journal for the study of religion in the American South)

Labyrinth: resources for medieval studies (a large digital library of documents and other primary sources on medieval history)

Library and archival online exhibitions (Smithsonian Institution)  Lists sites and links to exhibitions.

Luther, Index verborum (an electronic word index of the works of Martin Luther, in German, between 1516 and 1525)

McCarthy hearings, 1953--1954 (electronic version of the 5 volume collection released in the spring of 2003 by the Government Printing Office)

Medical history (links to sources on the history of medicine, including the history of diseases, treatments, and specialized procedures)

Medieval Sourcebook (full-text virtual library)

Mozart Project (life and times of Mozart, including biogrpahical material and catalog of his works)

National Archives and Records Administration, Digital Classroom (primary sources and document exercises)

National First Ladies' Library (bibliography and links to sources)

National Underground Railroad Freedom Center (biographical sketches, bibliography, links to other sources)

National Women's History Project

Native Web Resource Center (primary materials related to native peoples throughout history)

Neanderthal Museum (illustrates new finds, exhibits bones from the ten sites in Germany)

The New Deal Network (documentary sources for the study of FDR and the Depression era)

New York Public Library (various on-line sources and exhibits)

On-line books (including primary materials for research projects in history)

Palestine (United Nations information system on the question of Palestine, with primary documents)

Persia net (includes information on the history and culture of the Islamic Republic of Iran)

Plato (life of Plato, texts and analysis of the the "middle" dialogues: Republic, Phaedrus, Symposium, Phaedo)

Pompeii Forum Project (site surveys central forum in the city, escpecially its history between A.D. 62-79, includes building diagrams, inscriptions and other primary sources)

Precolombian culture (site covering the Aztec, Mayan and Olmec cultures)

Renaissance database (Renaissance Society of America's Iter)

The Richard III Society

Rutherford B. Hayes Presidential Center (includes Hayes's diary and letters, also a link to a database of Civil War soldiers from Sandusky County, Ohio)

San Miniato (Pisa) historical archive

Sixties (on-line exhibit of materials from the 1960's)

Spanish exploration/colonization (information, including primary material, on the expeditions of Captain Juan de Anza, and the colonization of California)

Suffragists Oral History Project (includes transcripts of individual interviews)

Tufts University Perseus Project (ancient Greek and Roman sources)

Underground Railroad (Personal narratives, text of Fugitive Slave Act, links to other sites, etc.)

United States Congress: Dirksen Congressional Center (Congressional policies and procedures, on-line Constitution, etc.)

United States Congress: documents and debates, 1774-1873 (documents from the First and Second Congresses)

United States Holocaust Museum

United States Supreme Court Database

University of Michigan Classics Homepage (more ancient sources)

Valley of the Shadow (Edward Ayer's project on Virginia and Pennsylvania communities in the Civil War)

Venetian Virtual Archive

Victorian Women Writers Project (transcriptions of 19th century texts by British, female authors)

Vietnam (documents, 1945-1975)

Vietnam War, bibliography

Women's history research guide (primary and secondary sources)

Women's studies database (primary and secondary sources)

World biographical index (searchable sketches on 2.4 million individuals, from the K.G. Saur Publishing Company)

World history documents (Mississippi State on-line historical documents)

World War I (comes from a course page from Haverford College, has links to primary material on World War I)

World War II (online document collection)

Yivo  Institute for Jewish Studies (on-line library, poster images, etc.)

Sites related to elementary and secondary education in history and the debate on "standards":

National Council for History Education

National History Education Network

Other sites of interest to historians:

ABC-CLIO (on-line Historical Abstracts)

American Historical Association

Center for History and New Media

H-Net (history job guide, discussion lists, etc.)

Journal of the Association for History and Computing (on-line journal)

Sixteenth Century Journal (electronic version of an important journal in early-modern history)

Women's Rights Movement (no real primary materials here at the moment, but a useful narrative history and timeline)

Law and History Review (on-line version of the journal)