To begin with I should point out there are previous books by Rosen relating to this subject. The books are called 'The Anatomy of Buzz' and there are several different versions. I haven't read any of these books, but from what I can gather they all appear to build on Rosen's original concept 'Buzz'. I have read previous books which cover in much less detail, word of mouth marketing (which is what this book is all about) and found some of them quite one-dimensional. It was refreshing to read a book that delves much deeper into word of mouth marketing. What I mean is word of mouth is something, I believe, is taken for granted, yet Rosen does a good job demonstrating through 'real world' examples (i.e. cold mountain) just how powerful it can really be. He suggests it is still, arguably, one of the most important forms of marketing.
I particularly enjoyed the authors discussion regarding just how much word of mouth marketing actually takes place face to face, compared to via social networking sites and the Internet. It was quite different to what I initially thought (face to face still reigns supreme). Although I enjoyed this book, I felt the author took too long to make his point in a few places and waffles on a little bit, hence only 4/5. Having said that, others may disagree. Nonetheless, I found this book a very worthy read.
If you want a very good resource on word of mouth marketing, strategies, concepts and pitfalls, then this book goes a long way to ticking those boxes.