Rework

Cut out the fluff and focus on what is important. That is the theme of Rework as well as a good description of the book itself. It is short, but clearly states the point. There are plenty of examples that now seem quite dated. (A camera company was mentioned as an example. Who would buy a camera these days?)

37 Signals started out as a web design firm. They created the Basecamp project management software for their needs along with Ruby on Rails framework to implement it. They then moved out to focus entirely on software development. The company intentionally did not grow to have a large number of employees or to bloat the product with features. Not getting too big gives the company freedom that they would not have if they were huge. Not adding every feature allows them to focus on features that are most needed for the small clients. They have their market and excel at it. 

Their plan is a great one for an ongoing niche player. They don't intend to be huge or even have an "exit". They want to continue to do a good job at what they do.