I should let you know that Lulu, the company that prints our books, is offering free shipping on book orders over $50 through March 17— tomorrow night. So you can save big if you order, oh, both of the Cruise Ship Drummer! books, plus one of the many other drumming books available through the site.
Two of the more interesting-looking things I found:
The epic The Drummer's Workbook by Jay Lawrence, a 223 page, “six pronged” approach to nearly everything to do with drumming.
Chordal Drumming by Maximilian Oepen, which looks like an interesting reinterpretation and refinement of the things found in the middle, “harmonic” section of Dahlgren & Fine.