The thing that immediately struck me upon opening Jeffry Wert's Cavalryman of the Lost Cause: A Biography of J. E. B. Stuart (Simon & Schuster, 2008) was the exceptionally large bibliography, jam-packed with manuscript materials. At 400 pages of main text (however, only 45 are devoted to Stuart's pre-Civil War life) it's an in-depth military biography of the man. Looks like this will be the new standard work.
Ranger Hoptak has already posted a review. His findings seem to confirm my initial impressions of the book.