I've been around DSLR even before the D80 came out. When I first tried digital, I had a Minolta Dimage 7 and then a Konica-Minolta A2. Still impressed with some of those low pixel count photos.
Then after using Canon film cameras, I was only thinking about Canon until a fellow employee task with being the company's photographer had the company's latest greatest Canon to shoot with, and still used her Nikon exclusively.
When I had to shoot a wedding, I purchased a D7000. I had only a couple of weeks to get used to the camera, and make sure I had it setup right. I bought both David Busch's "Nikon D7000" and Darrell Young's "Mastering the Nikon D7000". After the wedding, I used Darrell's book to get a discounted Nikonian Gold Memebership. After that I also got Hogan's digital copy of his D7000 "book".
The Busch book was the easiest for me to use & setup the D7000 according to the type of photography I was going to shoot. I'm not saying that the Young book isn't very good, but I found the Busch book to be faster to get up and shooting the things I wanted to shoot.
To be fair to Hogan, I haven't actually read his "book". Perhaps I already knew most of what I needed to know, or maybe I am not a good candidate for an instructional book on the PC.