(This article was first published on Revolutions, and kindly contributed to R-bloggers)
If you haven't made the plunge yet to making R graphics with Hadley Wickham's ggplot2 package, his "ggplot2 basics" slides (from the recent Introduction to Data Visualization and Analysis course at JSM) is a good place to start. Once you get the hang of the "grammar of graphics" notation, you'll be building beautiful data visualizations like this or this or these in no time.
Hadley Wickham: ggplot2 basics
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
