Agree Josh. It was a trendsetter for lean startup movement. Other good books in the series include Lean Product Playbook by Dan Olsen and Ash Maurya's book
I would recommend
Hey, Whipple, Squeeze This: The Classic Guide to Creating Great Ads
It's a great book for every entrepreneur who starts to promote their products/services. The voice is so friendly and the examples are also very practical as well. I took some advice from this book to set up social media channels for my product - Petgotchi!
The Lean Startup: How Constant Innovation Creates Radically Successful Businesses by Eric Ries. This book details how to create and maintain a successful business in the startup world. It covers customer development, rapid experimentation, iteration, and the importance of data-driven decision-making. It is an essential read for entrepreneurs looking to stay competitive and take their businesses to the next level.