Each night before I go to bed I would spend time reading this book first (Digital Field Guide).Definitely an upgrade of the manual. The book is good if you're a novice photographer just like me and wanting to master the functions of the Digital Rebel Xti/400D. Reading the book has helped me understand the elements of exposure,creative zone shooting,lens choice,photography basics,composition,ISO,light,depth of field,and techniques for great photos.The samples are also well set out and nicely illustrated,which I really love. If I get confused while adjusting the exposure I would just go back and scan that particular topic. Very easy to understand and definitely a must have!
Since I want to explore more in the world of digital photography I felt the need of buying another book or two. I've heard Scott Kelby's books are excellent and the reviews are pretty good. These might be my next purchase then.