Hadley Wickhams's GitHub page for his advanced R development courses. Includes useful material on advanced programming in R as well as package development.
There should be a better way of finding your R package than searching though a page of short descriptions of all 2800 package.s But there isn't.
Combination example code for common things and tutorial.
A bunch of R code to fit your power law distributions.
It's exactly what it sounds like. Good? Slightly horrifying?
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.