As the music director of a year old seeker-oriented worship service at my church, I found this book very well-written, and expect it to be very useful.
One thing I appreciated very much was the author's clear desire not to over-categorize or stereotype people. While she uses the terms "seekers" and "followers", she opposes the practice of separating the two groups in worship and instead focuses on ways to create a service that will welcome the seekers without failing to nourish the followers.
In addition to being inspirational and providing new ideas, it also laid out a number of good explanations for things I've believed or done all along; it's great to have something in print to point to to help explain why you do things the way you do!
I think this book would be very helpful, though not a complete resource, if you're beginning a brand-new seeker ministry.