Slightly better description

DESCRIPTION

@@ -4,7 +4,7 @@ Title: Tools for splitting, applying and combining data
 Version: 0.1.6
 Author: Hadley Wickham <h.wickham@gmail.com>
 Maintainer: Hadley Wickham <h.wickham@gmail.com>
-Description: plyr is a set of tools that solves a common set of problems: you need to break a big problem down into manageable pieces, operate on each pieces and then put all the pieces back together.
+Description: plyr is a set of tools that solves a common set of problems: you need to break a big problem down into manageable pieces, operate on each pieces and then put all the pieces back together.  For example, you might want to fit a model to each spatial location or time point in your study, summarise data by panels or collapse high-dimensional arrays to simpler summary statistics.
 URL: http://had.co.nz/plyr
 Depends: R (>= 2.8)
 Suggests: RUnit, abind, tcltk