http://www.r-project.org/

http://www.xemacs.org/

http://www.xemacs.org/Documentation/packages/html/ess.html

Jim's Introduction To R with some extra historical notes.

rinstall2.pdf An R introductory document that might be useful for teaching R to classes with non-stats students.

This is a document giving a tutorial on how to write C++ compiled packages to interact with R, intended for more advanced users, mostly geared to Windows machines.

alanrpackagetutorial08.pdf