The Lean Startup is a good high level overview of the underlying concept. I found it a bit overly focussed on launching "lean startups" within big companies. This may have been to boost consulting. Whatever the reason, it made the book less relevant to my experience.
But the Lean Startup is a quick, easy read, and you will get some actionable knowledge out of it if you're not already familiar with the ideas.
If you already know the concept, but want to put it into practice, go with Steve Blank's book.
Nail Then Scale It: http://www.amazon.com/dp/B0055D7O1U/?tag=dedasys-20
I've heard good things about this too: http://www.amazon.com/dp/B006UKFFE0/?tag=dedasys-20 - if anyone wants to comment on how it compares to "Nail It".
I've also got Steve Blank's book, but haven't read much of it yet. I'm signed up for the course though, and agree that he seems like a good speaker, although I haven't had much time for it yet.
One minor irritant so far - there are readings from two other books, which I'll probably buy, but not expect we're needed. The Lean Startup is one of them.