I run a number of lean startup seminars, primarily in the Colorado area, ones that cover the inception->product stage and ones that cover the "how to incubate new ideas in an existing enterprise". Lately the bulk of these have been based on Ash's Lean Canvas, a model that in my opinion exposes risk and next steps more effectively than Alex Osterwalder's BMC (also a great tool).

The big issue that comes up after companies run their initial tests and get a first working model is "what next" -- or more specifically, how do maintain the pace of innovation my organization requires after the initial excitement period, and how do I create an organization that supports this pace?

Ash's approach in Scaling Lean gives you ways to find your answers to several questions:
-- How do I know if I have traction? Specifically, how do I use real-world, non-vanity metrics to know what's working.
-- How do I know where my bottlenecks and contraints are? Specifically, what can I do to identify and make progress given the realities of my current situation?
-- How do I run effective experiments? What should I be testing, and what should I test first, based on my company's business model, size, etc.
-- Where should I focus? How do I add up all the above to know where to spent the limited resources (time, money, and people) I've got?

Scaling Lean answers these questions in an effective and concise way, or at least gives you the tools to be able to find the path to answering them yourself (which is what lean startup is all about). It's relatively short, and not filled with too many anecdotes- the real-world examples are well chosen and not just filler (like so many business books).