You can call me narrow-minded, but such books are based on the premise that the blog juice is already there but it just needs to be squeezed the right way. While I don't doubt that the knowledge exposed in this book is useful, one should be aware that we're talking about a limited fringe of improvement over the real value of a blog: it's content.

There are many ways to squeeze an orange, if you want to get yourself a fine glass of juice, you're better of finding a good juicy orange instead of learning the ultimate squeezing technique. Just my two cents.