I think I have every edition of this book since it has been published. With all the talk of Agile Product Development, I am still an advocate of the Stage Gating Process. The author explains how it can be scaled back for certain applications to make the gating process more agile.
I am presently working on building a Data Mart to support New Product Development (G1 -> G5) and Product Management processes (G5 -> G9). This book primarily focuses on "New Product" like the title says, however sometimes you have to focus on simply better managing the product you have in the marketplace!
I would like to see a expanded section (or new book) on better managing products from G5 to G9. I have been mapping out this process and it generally can be described as Post-Launch (Infancy Stage) to Maintenance Stage, to Refresh Stage (Renew Product Feature/Functionality or Pricing Changes) to Retirement Stage. We are trying to capture the metrics for products within a portfolio that can be automated into a Product Portfolio Heat Map.
Other than that I think this is a great book.
Gary E. Smith