The sesquicentennial means lots of people are paying attention to Civil War history. One of my favorite sites is the Civil War Trust, a non-profit that works to save endangered Civil War battlefields.
That's a worthy goal all on its own, but I think genealogists should also pay a visit because they offer excellent maps of Civil War battlefields. And because this is the 21st-century, they also have an iPhone app that informs your visits in person.
So if you're doing Civil War research, visit the Civil War Trust and also consider giving a few bucks to support their mission.