An R Reference Card for Data Mining (PDF) is available for free download at www.rdatamining.com, which lists many useful R functions and packages for data mining applications.
Pls see the link also for document R and Data Mining: Examples and Case Studies - an introduction on using R for data mining with examples and case studies.
Comments:
Paulo Cortez
I developed the rminer package for R, which facilitates the use of DM algorithms for classification and regression tasks. The package is available at:
www3.dsi.uminho.pt/pcortez/rminer.html and also
CRAN: cran.r-project.org/
Regards,
Paulo Cortez
www3.dsi.uminho.pt/pcortez
Gregory Piatetsky
Also, there is a great book "Data Mining With R" by Luis Torgo
www.liaad.up.pt/~ltorgo/DataMiningWithR/
and R code is available on the companion site