David Woodbury's most recent post deals with the online digitization of the wonderful Official Military Atlas of the Civil War (I use the book a great deal). There was also a nice entry a while back with links to reviews of various atlases published within the past few years. No doubt many of you have seen the new Barnes & Noble edition (available both online and in their brick and mortar establishments). It is difficult to complain about it because I was so pleasantly surprised that they reprinted it...and at a price that is practically giving it away...but I do believe it is a step down in quality from previous editions (at least the one I am familiar with).
My own copy is the out-of-print 1983 Gramercy Books edition, the red one (at right). With its darker, crisper lines and more vibrant colors, I much prefer this edition to the B&N volume. The B&N map plate reproductions appear significantly lighter and pixelated to my eyes. Overall, though, I would never want to discourage anyone from buying it. If you are on a budget, you can't beat B&N's price and it does have one very welcome change--the plates are no longer ID'd with Roman numerals. When flipping back and forth from the Gramercy index, the translation in your head can get tedious with the higher plate numbers!
Whichever edition you get, there is one great use common to all. It's sturdiness and great size & weight make it the perfect tool to reflatten Civil War magazines or paperback books bent or folded by the USPS in transit. Immediately upon receipt, all of my Blue & Gray's spend a week under its lovingly gentle crushing force and emerge like they're hot off the press.