How exactly are you unclear at what 37signals does? Go to their website and see all the products they've created. Read their blog and you will see how they make

How exactly are you unclear at what 37signals does? Go to their website and see all the products they've created. Read their blog and you will see how they make their products, how they make their decisions and how many customers they serve. They've opened their working process through recent blog posts, which I've found to be very interesting - especially reading how team member communicate and the types of language they use while working remotely. And with two books under his belt dozens of blog posts, and a column in Inc. I surely don't think this was ghost-written, which seem to be insinuating.