As an aside, I worked on a very large Ruby app (built by about a dozen developers over the course of years) and then later worked on another very large Ruby app of similar size. One of the employees there remarked that it was the largest Rails app built. I think the people who write very large Ruby apps tend to be very quiet about it (no blogs, no open-source, less community participation, etc.) so that if you're one of the ones writing a very large Ruby app you think yours is the largest. :)