The talented Dirk Eddelbuettel has just announced that his new book is coming out this year. I would recommend this book for anyone trying to use R for analytics, Big Data or customized use cases especially if they have a need to speed up the computation times. Rcpp can speed up R by a huge magnitude, and thats because C++ comes closer to the metal.
If you are a business analyst who knows a bit of R, but always were intimidated by C++ programming, well this is the right how to do book for you.