Some useful R code examples on graphics are:
Learn R Toolkit:
It contains PowerPoint slideshows, videos, R scripts and data files to help Excel users move up to R. R code examples are provided for panel charts, conditional format, dot plot, box plots with or without points, and fully annotated histogram charts.
It is composed of 5 modules:
Module 1: Installing & Setting Up R
Module 2: Compare R and Excel Worlds
Module 3: R Script Basics
Module 4: R Charts
Module 5: Box, Dot, Histogram, Strip Charts.
Using R for Advanced Charts:
It presents examples on lattice plots, step chart, boxplot, trend chart, panel chart, etc.
Peter’s R Programming Pages:
It presents R code examples on various R plots, including 3D bar charts, matrix contours, microarray heatmaps, network graphs, scatter & pairs plots, Ramachandran (phi/psi) plots, and linear models.
Yanchang Zhao
PhD, Data Miner
Email: yanchang (at) rdatamining.com
RDataMining: http://www.rdatamining.com
R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).