How to develop a package in R?

r package s4

Consult the following reference material:

Chapter 1, Creating R packages, of the Writing R extensions manual. This is the canonical source. It's the ultimate reference point, but not necessarily the best starting point.
A short presentation outlining the key ideas in package development and using the devtools package for development
Hadley's devtools wiki, particular the Package basics section.
The R help for ?package.skeleton and ?create in devtools.
The presentation by Uwe Ligges at useR!2010 on package development.
R Packages by Hadley Wickham.

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