American Memory from the Library of Congress
Over 70 collections from the Library of Congress now online, including Civil War maps and photographs, documents from the Continental Congress, George Washington's papers, portraits of the presidents and first ladies, selections from the National American Women's Suffrage Association, and much more.

American Slave Narratives
The history department at the University of Virginia has collected the narratives of 2300 former slaves.

Congressional Research Service Documents
Official Intelligence documents, including Congressional debates, laws and federal regulations, and presidential directives.

Elizabeth Cady Stanton and Susan B. Anthony Papers Project Online
A wonderful site that provides the reader a look at the writings and speeches of two of the most important leaders of the women's suffrage movement. Includes quotations, timelines, and related sites.

National Archives and Records Administration -- Primary Sources for the Classroom
Contains reproducible copies of primary source documents, including the Constitution, items relating the founding of the U.S. Navy, the Amistad case, Jackie Robinson, World War II and the speeches of Franklin D. Roosevelt, women's suffrage, and much more. A great site for teachers, with lessons, as well as hints as to how to use original documents in a classroom situation.

Speech and Transcript Center
A databases of speeches given by political and historical figures, as well as transcripts of television and radio programs. Includes a searchable NPR link. Excellent!