An update to the ggplot2 "grammar of graphics" package for R is now available on CRAN. This version introduces "Themes" for ggplot2 charts, and makes it possible to define and re-use your own preferences for title fonts and sizes, tick marks, grid color, etc. The system is heirarchically defined, so for example you can choose a font and have it affect just the main title, or every font in the chart.
This release also includes a few other new features, like support for CDFs (cumulative distribution charts) as native plot elements. You can read all the details in the release notes.