I recently finished reading a book co-authored by my new friend Patrick Vlaskovits. It's called The Entrepreneur's Guide to Customer Development, and it was a fast, enjoyable read.
The book's subheading is "A 'cheat sheet' to The Four Steps to the Epiphany," a different book by Steve Blank. As Patrick described to me recently, Steve's book is the bible on customer development practices but is thick and filled with tons of information that is handy as a reference but takes dedication to read from start to finish. Patrick's aim with his book was to distill the main concepts into an easily digestible introduction. I enjoyed reading Patrick's book, and it did fulfill its goal. I'm now motivated more than ever to try to read Steve's book soon.
I also was fortunate to recently attend a LeanLA meet-up where I got to meet other members of the community interested in lean start-up concepts (and hear from the founders of Sharethrough how they used lean concepts to build their business). The "Lean" movement, as I've recently learned, is basically combining customer development practices pioneered by Steve Blank with agile development concepts that have been gaining traction in the tech community over the last 5-10 years.
The core lessons I took away from the book were as follows. The book is short and sweet, so I won't spoil all the fun (no need to write a distillation of a distillation); go grab a copy yourself. It also has awesome case studies and templates of emails and cold calling example scripts that you probably won't use verbatim but illustrate the concepts really succinctly.