Two blogs have been more than helpful - they're so well written and engaging that they've become must reads for me. I've mentioned the fabulous Disunion posts at the New York Times and the Emerging Civil War blog written by National Park Service historians before. I'm doing so again.
Read these blogs. Seriously - though the blogs are not always serious. There are moments of humor and even whimsy. My latest favorite post at Emerging Civil War is a set of photographs Antietam Remembered. I will not forget the image of the Union soldier reenactor and his cell phone. I loved Roxana Robinson's post on coming to terms with her Great-Aunt Hattie's legacy at Disunion. Hattie, by the way, is more commonly known as Harriet Beecher Stowe. Great stuff.