If you also read the articles, how is that other stuff difficult to find out? It's like a google query away...
The make a SaaS offering for groupware (coordination, scheduling, chat, etc).
They also created the Ruby On Rails framework, related to which you'll see 2-3 articles per day on HN.
They also wrote a few business books, two of which have been NYT best-sellers.
The make several million dollars a year, and have tens of thousands of customers.
Their business, a standard profitable, bootstrapped business if a ever saw one, is often sneered by startup kiddies on HN because they haven't sold their company for VC mega-bucks or had a huge IPO, VA Lin^H^H^H^H^H^H Google style. (Normal companies are apparently passe in the web 3.0 age -- a new Apple would be something to point and laugh at, a Ben & Jerry's even more so).