Listing of classic R datasets used in various packages

Markdown package for the R statistical software environment. Handy for publishing R code (e.g. to Rpubs) and for integrating latex, comments and other text more seamlessly into code.

An example of R code that tests for a mediation relationship.

Resources on statistical mediation curated by David MacKinnon. Very thorough.

David Kenny's homepage. Especially useful for resources related to mediation and moderation, but also full of stuff on other sorts of statistical modelling techniques

A somewhat hard-to-find-but-useful set of ggplot2 examples buried on Hadley Wickham's site.