(This article was first published on macsci, and kindly contributed to R-bloggers)
To make it even more interesting, you can group figures with textboxes, move them around, and as long as you ungroup the figure/textbox before you print (to pdf) the quality is fine.
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).