I have the owners manual and got to using the camera. Found the manual some what tedious to stay focused to, hence hard for me to learn from. I bought the Mastering the D90 book, and found it easy to read, with the info pouring out in what I would describe as a situational format. Relating those situations to things I have experienced made learning interesting, and hence I learned alot of stuff that I would never have known, where it not for Daryl"s book.
I recommend this book without reservation
The value of wisdom is in its retention and disbursment