In addition to the standard 'du' command, which you can sort and munge with the standard unix stuff, Gnome has bundled the 'baobab' utility for the last few rel

In addition to the standard 'du' command, which you can sort and munge with the standard unix stuff, Gnome has bundled the 'baobab' utility for the last few releases (so if you're on a relatively recent Gnome release, you probably already have it installed). It has an interactive "rings" view and a "treemap" view, which are both pretty nifty.