Filelight graphically represents a file system as a set of
concentric segmented-rings, indicating where diskspace is
being used. Segments expanding from the center represent
files (including directories), with each segment's size 
being proportional to the file's size and directories
having child segments. 

Author: Max Howell <max.howell@methylblue.com>
WWW: http://www.methylblue.com/filelight