My favorite intro to R book is The Art of R Programming by Norman Matloff http://www.amazon.com/The-Art-Programming-Statistical-Softwa...

This is a new book by Danny Kaplan that I was able to provide some feedback on prior to publishing:

http://data-computing.org/

I really enjoyed the book, it took a modern approach to R using many of the newer packages (dplyr for instance) and ggplot and combined them into a very nice introduction to R with labs, etc. Well worth checking out.

Discovering Statistics Using R by Andy Field. AINEC.