Hi David, I hope that the following may be useful to you and your students.
http://cran.r-project.org/web/packages/OIdata/index.html OIdata: Data sets and supplements (OpenIntro)
A collection of data sets from several sources that may be useful for teaching, practice, or other purposes. Functions have also been included to assist in the retrieval of table data from websites or in visualizing sample data.
http://cran.r-project.org/web/packages/openintro/index.html openintro: OpenIntro data sets and supplemental functions
This package is a supplement to OpenIntro Statistics, which is a free textbook available at openintro.org (at cost paperbacks are also available for under $10 on Amazon). The package contains data sets used in the textbook along with custom plotting functions for reproducing book figures. Note that many functions and examples include color transparency. Some plotting elements may not show up properly (or at all) in some Windows versions.
http://cran.r-project.org/web/packages/ElemStatLearn/index.html ElemStatLearn: Data sets, functions and examples from the book: "The Elements of Statistical Learning, Data Mining, Inference, and Prediction" by Trevor Hastie, Robert Tibshirani and Jerome Friedman
Useful when reading the book above mentioned, in the documentation referred to as ‘the book’.
http://cran.r-project.org/web/packages/languageR/index.html languageR: Data sets and functions with "Analyzing Linguistic Data: A practical introduction to statistics"
Data sets exemplifying statistical methods, and some facilitatory utility functions used in "Analyzing Linguistic Data: A practical introduction to statistics using R", Cambridge University Press, 2008