Devtools 1.10.0 is now available on CRAN. Devtools makes package building so easy that a package can become your default way to organise code, data, documentation, and tests. You can learn more about creating your own package in R packages. Install devtools with:

install.packages("devtools")

This version is mostly a collection of bug fixes and minor improvements. For example:

To see the full list of changes, please read the release notes.