The R Project home page, for information about R.
The Comprehensive R Archive Network (CRAN) web site, for R software.
R manuals on line.
R frequently-asked-questions lists (FAQs).
The R Journal.
The Bioconductor Project: R software for bioinformatics.
The Rseek search site: Search R email lists, packages, etc.
The R Wiki.
R Bloggers web site.
R email lists.
R questions and answers on Stack Exchange and Stack Overflow.
Tom Short's R
reference card.
Johnathan Baron's R reference card.
Paul
Johnson's R-Tips page.
Trellis graphics manual.