I have previously written on this topic - how to find your way around the vast, sprawling (and free) statistical language and analysis system that is R, but some new resources have come to light.

Specialized R Search Engines

• Rseek
• Rsearch

Reference Cards

• R Reference Card, by Jonathan Baron
• R Reference Card, by Tom Short
• Time Series Reference Card, by Vito Ricci
• Regression Reference Card, by Vito Ricci
• The R language – a short companion
• VGAM Reference Card

also
the R wiki and the R Graph Gallery (includes source code), the R Language short companion , and as usual more links from Wikipedia
including links to some front-ends (in case you don’t want to program directly in R) of which StatisticalLab looks interesting