This really is amazing news, Eric is leading this movement. The Lean startup is influencing every part of this 'industry' if you can call it that considering how broad startups can be.
Their pre-sale was so well marketed that I managed to order 3 different copies without realizing it (all from different channels or at different times, i.e. my error).
Congrats Eric! Being on the bestseller list should drive awareness of your methodologies to a broader group. You've been working hard at it. Keep it up!
Ash Maurya's Running Lean did not get as much attention, but it is also a great book[1]. Many of his experiences are also easily found on his amazing blog[2].
I'm usually in the camp of "those who can, do; those who can't, read business books" but this book is worth stopping everything you're doing and fully internalizing.
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.
It is easy to read and full of things that sound very obvious in hindsight (but often the 'obvious' things are those things that are important).
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