Here are some resources from outside of this course that will probably be useful in learning R.
Try R: an free interactive in-browser tutorial
Twotorials: a series of two-minute videos introducing R
ggplot2 docs Documentation and detailed examples of all ggplot2 functions
Tidy Data: An excellent paper that lays out an essential guide to shaping your data to make manipulation, analysis and visualization easy
The R Inferno: an amusing guide to some of R's more surprising traps.
R Packages A tutorial to writing and publishing your own R packages
knitr: An R package for producing reproducible reports that integrate R with LaTeX or markdown.
Shiny Easily create interactive web visualizations using R
Bioconductor: A repository of R packages for analyzing genomic data, including genome sequencing and expression analysis.