I've read countless books on the subject of launching a startup. Some of my favorites include Eric Sink on the Business of Software and Getting Real (by 37signals). While those books helped get me started on the road to successfully launching a startup, they didn't have the impact Rob's book had in helping me successfully launch my product.The stuff in this book helped me in countless areas:  building an email list, cutting development time in half, getting traffic to my sales site, and so on. Seriously, if you want to drastically improve your chances of being successful with your product, read this book.