Hadley Wickham has a new version of tidyr out:
I’m pleased to announce tidyr 0.5.0. tidyr makes it easy to “tidy” your data, storing it in a consistent form so that it’s easy to manipulate, visualise and model. Tidy data has a simple convention: put variables in the columns and observations in the rows. You can learn more about it in the tidy data vignette.
Check out the latest version of tidyr; it’s one of the most useful data manipulation packages on the R platform.