One of the most interesting of the many Civil War anniversary projects comes from the Southern Historical Collection at UNC Chapel Hill. Civil War Day by Day will post a different document every day for the next four years, each 150 years old to the day. The collection will build day by day (beginning today, of course), and an interactive calendar will allow you to jump to any of the past days and their documents. Read more about it here.
This and other interesting Civil War links will be collected on the right side of the Past Times homepage.