Earthen Walls, Iron Men: Fort DeRussy, Louisiana, and the Defense of Red River -- by Steven Mayeux (University of Tennessee Press, 2007).
For me, this is one of the most anticipated Trans-Mississippi titles for the year. Also a dedicated preservationist, the author is president of the Friends of Fort DeRussy.
The Battle of Natural Bridge, Florida -- by Dale Cox (Dale Cox, 2007).
The March 1865 Confederate defense of Tallahassee, Florida. It's a completely revised and expanded edition of Cox's 2001 publication, and a nice follow-up volume to his excellent recent work on the Battle of Marianna, see review.
Monocacy: The Battle That Saved Washington by B.F. Cooling (White Mane, 1997).
I finally purchased a personal copy of this great study, which should have made my "Best of White Mane" series of posts way back when. With a new interest in Early's valley high jinks, I am looking forward to re-reading it. I was also going to comment on a brand new publication about this battle but I think Eric summed it up well enough on his blog.