Abraham Lincoln Papers at the Library of Congress
http://memory.loc.gov/ammem/alhtml/malhome.html
American Experience | The Time of the Lincolns | PBS
http://www.pbs.org/wgbh/amex/lincolns/
The Lincoln Institute: The organization studies the president's impact on the American political system. Features include interactive maps and several web publications.
http://www.abrahamlincoln.org/
The History Place Presents Abraham Lincoln: Timeline of Lincoln's life from his birth in 1809 to his assassination in 1865. The site features links to photographs, manuscripts and speeches.
http://www.historyplace.com/lincoln/
Abraham Lincoln Historical Digitization Project: presents historical materials from Abraham Lincoln's Illinois years (1830-1861), including Lincoln's writings and speeches,
http://lincoln.lib.niu.edu/
American Presidents: Life Portraits > Abraham Lincoln A Site to Complement C-SPAN's 20th Anniversary television series, American Presidents: Life Portraits, March-December 1999 , The web site, created for the television series, contains a complete video archive of all American Presidents. http://www.americanpresidents.org/
The Gettysburg Address | Library of Congress Exhibit
http://www.loc.gov/exhibits/gadd/
The American Presidency includes articles from four Grolier encyclopedias, suited to different reading levels. http://ap.grolier.com/browse?type=profiles#pres
Read more about Abraham Lincoln in July 4, 2005 issue of Time Magazine online