I picked this up at a Fry's Electronics recently and read it as much to increase my knowledge of basic electronics as power-related issues. Except for the theory behind switching-power supply operating that is a little rushed, it's an enjoyable, practical and -readable- book on all the many 'gotchas' that will get you in your attempts to achieve clean power. As a recording studio engineer, I found the generous (and subtle) info on grounding, 3-phase power, ground lifts, crosstalk, etc. just right.
Three if by Space
Not only is this an excellent book, explaining why whatever power protection you have on your home computer is likely to be ineffective, I also found it to contain considerable information that old school electricians were completely unaware existed. (And didn't believe, in a critical situation at work.) Also, there are things in this book that your power company won't talk about, unless prompted. (I had to do that at another company.) The moral of the book is: Your power is nowhere near as consistent as you imagine.