1. A Little Short of Boats: The Civil War Battles of Ball's Bluff and Edwards Ferry, October 21 - 22, 1861 by James A. Morgan III (Savas Beatie, 2011).
Originally published by Ironclad in 2004, this book became one of my favorite small battle studies, and the new edition (beyond the obvious physical improvement from paperback to hardcover) promises to make a great book even better. Beyond a few corrections as well as expansions due to additional source discoveries, Morgan also delves even deeper into an important theme from his earlier work, namely his effort to correct the traditional interpretation of the battle as part of a planned campaign to capture Leesburg.
2. The New Gettysburg Campaign Handbook June 9 - July 14, 1863: Facts, Photos, and Artwork for Readers of All Ages by J. David Petruzzi and Steven Stanley (Savas Beatie, 2011).
With full color pages printed on heavy, high-gloss paper, this is a beautiful little guide to the campaign. Subjects includes facts & figures, Stanley's incomparable maps, myth discussions, quotations, photographs, biographical sketches, a brief campaign & battle history, and an OOB.