Organizations of Historians:

The American Historical Society: http://www.theaha.org

The Organization of American Historians: http://www.oah.org

H-Net: http://www.h-net.org

Phi Alpha Theta Honor Society:  http://www.phialphatheta.org

National Humanities Center:  http://www.nhc.rtp.nc.us/

American Council of Learned Societies:  http://www.acls.org

General History Research/Teaching Organizations:

National Endowment for the Humanities:  http://www.neh.fed.us/

National Archives and Records Administration:  http://www.archives.gov/index.html 

Library of Congress, American Memory Collection: http://lcweb2.loc.gov/ammem/

The Smithsonian Institution:  http://www.si.edu/

History News Network:  http://historynewsnetwork.org

History Matters: The U.S. Survey Course on the Web:  http://historymatters.gmu.edu/

The Newberry Library:  http://www.newberry.org/newberryhome.html

Teaching American History:  http://teachingamericanhistory.org/

Early American History Organizations:

McNeil Center for Early American Studies: http://www.mceas.org

Omohundro Institute of Early American History and Culture: http://www.wm.edu/oieahc

American Antiquarian Society: http://www.americanantiquarian.org

Massachusetts Historical Society: http://www.masshist.org/welcome/

Library Company of Philadelphia: http://www.librarycompany.org

The Huntington Library, American History Research Section: http://www.huntington.org/ResearchDiv/AmHistRes.html

Common-Place on-line journal: http://www.common-place.org/

International Seminar on the History of the Atlantic World:  http://www.fas.harvard.edu/~atlantic/

Early American History Images and Documents On-line:

Early Americas Digital Archive: http://www.mith2.umd.edu:8080/eada/index.jsp

American Journeys: Eyewitness Accounts of Early American Exploration and Settlement:  http://www.americanjourneys.org/

The Library of Virginia:  http://www.lva.lib.va.us/whatwehave/

Virtual Jamestown:  http://www.virtualjamestown.org

Massachusetts Historical Society: http://www.masshist.org/welcome/

Maryland Archives On-line:  http://www.mdarchives.state.md.us/megafile/msa/speccol/sc2900/sc2908/html/index.html

Digital History:  http://www.digitalhistory.uh.edu

The Virtual Library: History:  http://vlib.org/History.html

Bibliography of English-Language Diaries (838 to the present):  http://diarysearch.com/bibliography/default.htm

The Jesuit Relations and the History of New France:  http://www.collectionscanada.ca/jesuit-relations/index-e.html 

Historical Census Browser (1790-1960):  http://fisher.lib.virginia.edu/collections/stats/histcensus/

Films about Early America:  http://www.lehigh.edu/~ejg1/SEA/EAL-FilmIntro.html

Archive of Early American Images at John Carter Brown Library:
http://www.brown.edu/Facilities/John_Carter_Brown_Library/pages/fr_electronic.html

"The Atlantic Slave Trade and Slave Life in the Americas: A Visual Record (The University of Virginia):
http://hitchcock.itc.virginia.edu/slavery/