I think as I flush out the functional programming and computing on the language sections, those techniques underlying ggplot2 and plyr should become more obviou

I think as I flush out the functional programming and computing on the language sections, those techniques underlying ggplot2 and plyr should become more obvious. I like the idea of case studies on more complex packages, but I don't know if I can bring myself to try and describe how they work :/ Part of the problem is that I didn't understand the techniques terribly well myself when I wrote ggplot2 and plyr, so they don't have particularly clean implementations.