The chart sorts the pie wedges, smallest first, and colors the wedges with different colors. The chart is titled with the directory and machine name at the top, and subtitled with the total size at the bottom. Each wedge is titled with the percentage, directory name, and total size contained in the directory, if it's big enough. The files not in any subdirectory are collected as "(loose)".
To use it, in a shell window, type cd wherever ; diskpie
To install this on your machine,
The shell script works on Mac OS X or (some flavors of) Linux. You may need to edit it if your Linux works different from mine. (You could probably get this working on a Windows box, if you installed Cygwin and Perl, and changed the shell script to be a BAT file.)