The Lean Startup is a NYTimes Best Seller.
nytimes.com
nytimes.com
I think the lean movement (directly and indirectly) will increase value creation in silicon valley by 10-20%, and this is the holy book of it.
I love that he emphasizes the right things like vision plus a scientific approach (hypothesis and innovation accounting).
It goes beyond agile & lean software development best practices and adds customer oriented business concepts on top so you get a great framework for product development.
If your aim is to deliver great software products and satisfy your customer then the approach he describes is the best way I can think of to achieve your goal.
disclaimer: I am currently building a product influenced by the lean startup movement: http://www.blossom.io