Last week at the Lean Transformation Summit, Prof. Durward Sobek of Montana State University, gave a presentation about a new book just published called "Lean Product and Process Development" authored by Allen Ward. I think you'll find the book to contain some breakthrough thinking on applying lean thinking to product development. A link with more info on the book is http://www.lean.org/Bookstore/ProductDetails.cfm?SelectedProductID=159