The ggplot2 book by Hadley Wickham
From the post:
Since ggplot2 is now stable, and the ggplot2 book is over five years old and rather out of date, I’m also happy to announce that I’m working on a second edition. I’ll be ably assisted in this endeavour by Carson Sievert, who’s so far done a great job of converting the source to Rmd and updating many of the examples to work with ggplot2 1.0.0. In the coming months we’ll be rewriting the data chapter to reflect modern best practices (e.g. tidyr and dplyr), and adding sections about new features.
We’d love your help! The source code for the book is available on github. If you’ve spotted any mistakes in the first edition that you’d like to correct, we’d really appreciate a pull request. If there’s a particular section of the book that you think needs an update (or is just plain missing), please let us know by filing an issue. Unfortunately we can’t turn the book into a free website because of my agreement with the publisher, but at least you can now get easily get to the source.
Great opportunity to show off your favorite feature of ggplot2. Might even make it into the next version of the text!
I first saw this in a tweet by Christophe Lalanne.