I finished "Stretch: Unlock the Power of Less - and Achieve Than You Ever Imagined" by Scott Sonenshein a few weeks ago, and have had the ideas rolling around in my head since then. I really like the overall premise of the book: lean towards Stretching instead of Chasing. I found that it nicely connects to the ideas of Theory of Constraints and process improvement in general.

I came across "Guest Blog: Finding Science and Success with Lean Principles in R&D" by Norbert Majerus of Goodyear on the Factory Physics website, and it describes the Factory Physics ideas as applied in new product development, and I thought it was a pretty good summary. This is also a lot of what we do with Theory of Constraints concepts applied in product development (and project management) arenas too.