High Scalability: Making Twitter 10,000 Percent Faster detailing how Twitter, an RoR application running on Joyent Accelerators, scale to its current size. Information obtained from various sources. Interesting point on Erlang: "How do you get a broken server running at Sunday monday with 20,000 users waiting? The developer didn't know. Not a lot of documentation. So it violates the use what you know rule." How true. That does not stop Erlang being one of other billion things I would like to learn though.