These are a few in my bookmarks: Quick-R http://www.statmethods.net/index.html http://www.statmethods.net/index.html R for Programmers http://en.wikibooks

These are a few in my bookmarks: Quick-R http://www.statmethods.net/index.html http://www.statmethods.net/index.html R for Programmers http://en.wikibooks.org/wiki/R_Programming http://en.wikibooks.org/wiki/R_Programming SurviveR http://www.win-vector.com/blog/2009/09/survive-r/ http://www.win-vector.com/blog/2009/09/survive-r/ Official intro http://cran.r-project.org/doc/manuals/R-intro.html http://cran.r-project.org/doc/manuals/R-intro.html Might depend on your definition of accessible LOL Stack Overflow also very helpful - http://stackoverflow.com/questions/tagged/r http://stackoverflow.com/questions/tagged/r Rseek http://www.rseek.org/ http://www.rseek.org/ R-Help http://r.789695.n4.nabble.com/R-help-f789696.html http://r.789695.n4.nabble.com/R-help-f789696.html