Devtools 1.6 is now available on CRAN. Devtools makes it so easy to build a package that it becomes your default way to organise code, data and documentation. Learn more at http://r-pkgs.had.co.nz/. You can get the latest version with:

install.packages("devtools")

We’ve made a lot of improvements to the install and release process:

We’ve also added a number of functions to make it easy to get started with various aspects of the package development:

There were many other minor improvements and bug fixes. See the release notes for complete list of changes.