I picked this book and another by Kelby (The Digital Photography Book) based on reviews from this site and recommendations from several photography forums. When the two are compared, it is no contest Miotke's book wins hands down. That's not to say that Kelby's book is terrible, it is, in fact, quite good.
The Betterphoto Guide provides a comprehensive overview of digital photography and explains the foundation on which it's based. Technical elements like exposure and light are clearly explained in an easy to understand and succinct manner. As my understanding of the different components increased, I quickly moved away from the automatic settings on my camera (Canon Powershot A630) and the quality of my pictures soared.
Another important component of the book deals with the artistic elements of photography (Composition). What, how, and why are all discussed and all the suggestions are immediately applicable. After reading this book, I was able to compose better pictures with a tighter focus and, in addition, have gained a greater appreciation and understanding of other's work.
There are also chapters that discuss the particular components of a digital camera. These help the reader become "acquainted" with his/her particular camera. File settings and there importance are also discussed and will help the reader decide which is right for him/her (if one's camera allows that choice). A digital camera Buyer's guide is included at the book's end, which provides invaluable advice.
This book is targeted at beginners and is a great choice for both DSLR and p&s owners. My only caveat is that it will leave you wanting better equipment and more time to pursue your new habit. Er.. I mean hobby (Kelby moment).
Overall, I find this a beautifully illustrated book that provides a solid foundation on which to launch your photographic endeavor.