Working with Map Projections and Shapefiles in R
No need to settle for the mapping defaults in R. Apply map projections to show geographic data in a way most suitable for your work.
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Also known as waffle charts. Using animated transitions between values, you can allow for comparisons between categories.
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When you have several time series over many categories, it can be useful to show them separately rather than put it all in one graph. This is one way to do it interactively with categorical filters.
Voronoi Diagram and Delaunay Triangulation in R
deldir package by Rolf Turner makes the calculations and plotting straightforward, with a few lines of code.