This may be Matthias Paul Scholz's magnum opus, a book that combines history, art and NXT technology.
The heart of the book is building and programming instructions for five of da Vinci's contraptions: the armored car, the catapult, the revolving bridge, the aerial screw and the flying machine. Matthias provides five ways to program each of his five NXT models, using NXT-G, RobotC, NXC, pbLua and leJOS NXJ.
In addition, Matthias provides a detailed installation and configuration guide for each of the aforementioned programs. In my opinion, this guide alone is worth the price of the book.
Matthias provides a wealth of other material, including the historical background behind da Vinci's creations, as well as ideas for building other "NXT" da Vinci inventions.
A prediction: Matthias' NXT catapult will be standard equipment for office cubicles around the world.