R and Data Mining (RDataMining.com)
I have mentioned several resources from this site:
R Reference Card for Data Mining [Annotated TOC?]
An Example of Social Network Analysis with R using Package igraph
Book “R and Data Mining: Examples and Case Studies” on CRAN [blank chapters]
Online resources for handling big data and parallel computing in R
There are others I have yet to cover and new ones will be appearing. If you are using R for data mining, a good site to re-visit on a regular basis.