Baobab

baobab.png Baobab is a open source utility for any environment that can run a C/gtk+ application in a Gnome environment. This usually means that it’s linux, but there has also been instances of it running on MacOSX. In any case, the point of the application is to show your disk usage and be able to analyze it graphically. This can be done with any mounted partition or device, which means that Baobab allows you to real time surf your network shares, graphically.
On top of that, Baobab will display the requested tree of any folder structure. So you can choose the full file system, a single folder, or anything else you’re looking for to gauge file system usage through a graphical look.
Lifehacker < Baobab