https://github.com/hadley/devtools/wiki A place to learn R like a programming language, focusing on cross-cutting concerns and general concepts

http://www.r-bloggers.com/ An R blogging platform that has done a great job of promoting R and encouraging the community and gives a good sense of the state of R

http://tryr.codeschool.com/ Free R Tutorials from Code School and O'Reilly

http://cbio.ensmp.fr/~thocking/papers/2011-08-16-directlabels-and-regular-expressions-for-useR-2011/2011-useR-named-capture-regexp.pdf Fast, named capture regular expressions in R

http://www.win-vector.com/blog/2009/09/survive-r/ Survival guide

http://www.burns-stat.com/pages/Tutor/R_inferno.pdf A manual by Patrick Burns for R developers with lots of useful tricks and tips for reducing memory usage, improving performance, and avoiding errors in computational analysis

http://blog.revolutionanalytics.com/ Blog from the staff of Revolution Analytics on using R for big data analysis, predictive modeling, data science and more

Morte Tutorials

- http://www.statmethods.net/index.html
- http://heather.cs.ucdavis.edu/~matloff/r.old.html
- http://www.twotorials.com/
- http://en.wikibooks.org/wiki/R_Programming
- http://cran.r-project.org/doc/contrib/Paradis-rdebuts_en.pdf
- https://class.stanford.edu/courses/HumanitiesScience/StatLearning/Winter2014/about

http://cran.r-project.org/manuals.html Docs

http://onepager.togaware.com/ Handson Data Science with R

http://stackoverflow.com/questions/tagged/r?sort=votes&p... StackOverflow

Cheat sheeets

R Journal

http://rseek.org/ Rseek search engine

http://www.r-chart.com/ For experiences of web application/database developer whose tool kit includes R

Books

http://www.amazon.com/gp/product/0387981403 ggplot2: Elegant Graphics for Data Analysis by Hadley Wickham

http://www.amazon.com/dp/1449316956/ref=cm_sw_su_dp R Graphics Cookbook by Winston Chang

For more books relating to R

http://www.r-project.org/doc/bib/R-books.html