Over the last week, the guide has surged to become the 5th-most-accessed book on Project Gutenberg, an open source repository of free and public domain ebooks. It is also the fifth most popular ebook on the site over the last 30 days, having been accessed nearly 60,000 times over the last month (just behind Romeo and Juliet).
Direct link to the book (without the backref):
I’m pretty sure that the people at the companies I’ve worked at for the last 15 years have been following this playbook the whole time.