Today I learned about two forthcoming R books that I'm now looking forward to.
The first is Applied Predictive Modeling by Max Kuhn and Kjell Johnson. Max Kuhn is the author of the caret package, an extremely useful and powerful R package for fitting and optimizing all kinds of predictive models in R. It's available now on Amazon Kindle and will be published in hardcover by Springer in July.
The second is Dynamic Documents with R and knitr by Yihui Xie, the author of the knitr package. With knitr you can easily create beautiful documents and reports, with text, tables and figures all dynamically generated by R. It will also be available in July.