Something like treepie forMac :
GrandPerspective is a small utility application for Mac OS X that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space. It uses a so called tree map for visualisation. Each file is shown as a rectangle with an area proportional to the file's size. Files in the same folder appear together, but their placement is otherwise arbitrary.

If anyone known some other software for Disk Usage Analysis or more generally for Disk Management please give me a feedback to borgna.marco a t gmail.com or post a comment here.

And also somebody has see this type of multilevel pie used in any others field? It's really used only to show folders size ?

Do you need something similar to TreePie for Linux ? Bored of DU ?

try Filelight

it' s the coolest approach to disk usage display: TRY it!

You can also try KDIRSTAT wich is more serious and with a lot of functions, but less informative. It use treemap display: lot of confunsing squre one inside other to display disk analysis.

or

BaobapOpen Sourcehttp://www.marzocca.net/linux/baobab/

.

Filelight Filelight is an open software that shows your filesystem as a set of concentric pie (sunburst diagram)Open Sourcehttp://www.methylblue.com/filelight/

.

GD MapOpen Sourcehttp://gdmap.sourceforge.net/

.

KDE FSViewOpen Sourcehttp://docs.kde.org/kde3/en/kdeaddons/konq-plugins/fsview/index.html

.

KDirStatOpen Sourcehttp://kdirstat.sourceforge.net/

.

xdiskusageOpen Sourcehttp://xdiskusage.sourceforge.net/

check also http://www.dmoz.org/Computers/Software/Disk_Management/Usage_Analysis/



For windows a lot of disk usage tools are available (most as shareware):
Space Searcher
FolderSizes - Disk Space Management Software