The United States Civil War Center. A comprehensive index to Civil War websites, divided by category. Dynamite!
Civil War Archives. Check out the "Soldier's Letters" and "Soldier's Diaries" pages.
In the Valley of the Shadow. A very cool site. You can search primary source letters and diaries by keyword, such as "camp life."
The Smithsonian -- Civil War Archives. Click through the advertisement!
A Nation Divided --The History Place. A timeline of Civil War events , with battle links and information on other historic events such as "Lincoln Shot."
New Georgia Encyclopedia. (The state of Georgia's encyclopedia. Use the search box on the site.)
Historynet.com: The Civil War. (Use the search box on the site.)
Music: Civil War Music. From The Library of Congress.