The book sells itself as a recipe for designing, coding and marketing a successful web application. Since I am the technical lead on a commerce-based web application I figured it was worth the investment to get some ideas of where we are with our roll-out in comparison with what works for 37Signals.
37Signals has been very successful with their Backpack, Basecamp, Campfire and other web applications. It seems to me they have a technique they can reproduce and hopefully I can take some nuggets of information and carry them over to my work.
I am planning on a review of this book when I finish reading it over the next week or so.