The ports I see feel like a < 100% enumeration of the plots in the mainline ggplot2 package. However, there are heaps of great extensions to ggplot2 that I susp

The ports I see feel like a < 100% enumeration of the plots in the mainline ggplot2 package. However, there are heaps of great extensions to ggplot2 that I suspect are in part due to there being a carefully thought out set of abstractions at the low level of Grid that mesh nicely with the high level abstractions of ggplot. ggplot2 being built on top of Grid means that modestly complex stuff is easy (in ggplot2 by itself), but that it's relatively easy to drop down into the lower layer (grid) to do more.