This looks like a great project; however, I really wish there were a more descriptive README.
There is always a good time for some shameless auto-promotion, so I'll mention Triggr, a package which allows one to convert R process into a fast, event-based XML-, JSON- or even more freestyle RPC server: https://github.com/mbq/Triggr
Is this just a project with all the glue worked out between these projects?
I know many folks like ggplot2 much more than anything available for Python. What are the advantages of using R over Python?
R has exceptional libraries for doing statistical analysis. This kind of setup could be a great platform for building a statistical software suite as a service. Sort of like SAS or STATA or SPSS in the cloud.