On this page I collected computing resources in general. There is a lot of R related things. Here is a general tutorial page on scientific computing:
http://software-carpentry.org/v4/index.html
R
Books
R for Dummies (out 13 July 2012). Assumes zero programming knowledge.
Applied Econometrics with R. Great Book.
online resources
Tutorials from cran.r-project.org/doc/contrib
the directory in the title contains a lot of tutorials that were contributed to CRAN by users/experts. I had a look at those two and found them good, but there's bound to be others.
IcebreakeR. A very comprehensive tutorial/introduction to R.
Farnsworth's Intro for R in Econometrics
Tutorials from elsewhere on the web
Here's my collection of tutorials found on the web. Again, you can certainly find others.
https://www.datacamp.com/courses/introduction-to-r
UCLA Dept of Statistics R bootcamp. Great Resource of lecture slides.
Princeton 'getting started' tutorials.
Roeger Koenker's Applied Econ R Intro
R-tutor. Statistic tutorials using R. Hypothesis tests etc.
wiki book on R. lot's of examples
Other online resources
www.r-bloggers.com. Great place to see what others are doing.
knitr homepage. knitr is the next generation of Sweave (embed R computation in latex)
R website. click on "conferences" on the left. always tons of tutorials.
stackoverflow. extremely well informed forums on all code related issues.
online manual for ggplot2. packed with examples. thank Hadley Wickham.