This is a book I first came across a couple of years ago, when I was first getting involved in the idea of offshoring IT to India, and I found it very helpful indeed - it didn't just explain the concepts clearly, but gave some useful practical advice.
Once I got into my first experience of this type of work, I found I "outgrew" it a little, so moved onto some of the other texts out there, but for a newcomer to the field this is excellent and helpful reading.
And on re-reading, I started to see references and ideas that made much more sense once I had gained some real-life experience, so it is still relevant even to older hands in this game.
In terms of the more strategic aspects of where the whole global services revolution is going, I felt it was a touch superficial, but then again that wasn't what I bought it for, and I would imagine the same applies to most people who pick this up out of the many books now appearing on the subject.
All in all I recommend it to anyone looking at this subject from a practitioner's perspective, particularly those new to the it.