- An Introduction to R gives an introduction to the language and how to use R for statistical analysis and graphics.
- Another introduction to R by Vincent Zoonekynd.
- Jonathan Baron's R help page
- A very nice R graphics gallery
- R Installation and Administration provides information on installing add-on packages and installing R itself.
- Writing R Extensions explains how to create your own packages, write R help files, and the foreign language (C, C++, Fortran, ...) interfaces.
- R developer information
- R Data Import/Export describes the import and export facilities available either in R itself or via packages which are available from CRAN.
- Source code for R
- CRAN, the Comprehensive R Archive Network.
- A guide to using R with C/C++, an add-on to the Writing R Extensions manual.
- A guide to SAS and SPSS users with using R.