I found this book over at Powell books in Portland Oregon (Technical store). I've looked at a lot of DSP books trying to gain a basic undestanding of the subject (I'm interested in audio DSP). This is the first book that really clicked with me and got me off the ground. His explanations make sense and aren't clouded with a ton of non-essential theory. He explains the how and why of what you need to know in a straight forward manner helping me break ground where other books lose me on the same subjects. The down side of that is it's not as complete of a book as some of the others. For me it was completely worth it, I can look at other books for more in depth concepts and ideas. He goes over processing images as well as audio so don't get the idea that's it's an audio centric book. The one thing I found difficult was going along nice and easy and all of a sudden "WHAM!" he drops Euler's formula on me. I had to visit a number of other math books before I got that down.
So thumbs up if you are starting out, or even not. I have an experienced mentor at work who has taken interest in a few parts as well. Buy it and review it!