The American Civil War Homepage (The best Civil War links page)

 The 26th North Carolina Infantry Regiment (Good regimental history site)

 The Valley of the Shadow Project at the University of Virginia

 Civil War Photographs at the Library of Congress (hundreds of excellent images)

 African American Odyssey site at the Library of Congress
 (includes sections on the antebellum South, the Civil War, and Reconstruction)

 Civil War Women (at Duke University)

 Civil War Maps collection at the Library of Congress

 The Gettysburg Address

 First Person Accounts of the American South from 1860-1920

 West Point Atlas of American Wars

 The Official Records of the Civil War Online
  (Good source, but you need to know where to look in this version)

 Culpeper Courthouse (setting for Seasons of War)