[R] PhD student reading list, suggestions wanted

[Richard A. O'Keefe]

I've got a PhD student starting this year.
She'll be working on data mining.
She has asked for a reading list while she's still in her home
country, which is a really good sign.
Her cosupervisor and I don't (think we) have any problem with
choosing things that are specifically about data mining, but
there are some statistical ideas (sampling, exploratory-vs-confirmatory,
clustering) where I have things on my shelves I can recommend but
wouldn't mind advice.

But above all, I would like her to use R whenever it's appropriate.
We have MASS and Dalgaard's introductory book in the library here, I'm
aware of "S Poetry", but what do you think would be the best start for
someone learning R in order to use it for doing data mining?