Getting Real

You could read this in about an hour, it's on their website in PDF form for free, I wouldn't recommend paying for it since they openly distribute the free version.

I love Basecamp and their corporate philosophy, this book is sort of a Cliff Notes version of Basecamp (formerly 37 Signal's history). The book was written in 2006 or 2007 so a lot has changed with Basecamp and the industry as a whole since then but it's still a great guide on how to create a lean, humanistic corporate culture.

Why I only gave it 3 stars: I wish it was longer with more detail.