The book is about the best method to get great drum sounds even with inexpensive gear, although it covers a lot of drum related issues like tuning, studio environment, phase cancellation (the drum sound destroyer), and the drummer's headphone mix.
Of all the things in this book that I wish I knew when I started out, learning what it takes to make a drum kit sound good before you even put the mics up is number 1. Let's face it, if the drums don't sound good by themselves in the room first, no amount of electronic manipulation will make them sound good later.
A 90 minute DVD also comes with the book where Dennis takes you through the steps of miking each drum, getting sounds, and getting a mix together. Michael White (drummer for Steely Dan and Earth, Wind & Fire among others) the takes you through drum tuning and even plays a song.
For more info, check out The Drum Recording Handbook here.