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R is a collective project with contributors from all over the world. Their website (http://www.r-project.org) has more information on the R project, R packages, conferences, and other learning material.
In addition, there are several canonical references which you may wish to peruse:
Venables, W.N. and B.D. Ripley. 2002. Modern Applied Statistics with S. 4th Ed. Springer-Verlag.
Venables, W.N. and B.D. Ripley. 2000. S Programming. Springer-Verlag.