The R project website is a good place to start. From there you can download R as well as loads of documentation.
RStudio is an IDE for R. It is my preferred environment for using R.
NY times article on the growth in the use of R.
Free books on R
- SimpleR by John Verzani (142 pp). Very good introduction to R.
- page from StackOverflow listing lots of free (and non-free) R books.
R videos
- About 20 short videos on specific R functions from Texas A&M
- Over 30 5-10 minute videos. Mostly on graphics and R Commander.
- 90 two-minute tutorial videos.
Examples and R code
- Quick R gives code snippets to do many of the most common statistical operations
- The R graph gallery has examples of graphs and the code that produces them.
- R-bloggers is a meta-blog of blogs about R.