KDirStat
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KDirStat was a graphical disk usage utility based on KDE 3 libraries, The information provided is similar to the Unix "du" command. In addition to that, it comes with some cleanup facilities to reclaim disk space.
Discontinued
Development has been discontinued. In Linux distributions, like Debian and Ubuntu, there's still a kdirstat package but it is only a transitional package for the successor 
K4DirStat
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There is a MS Windows clone called WinDirStat. Yes, that one is the clone. KDirStat is the original.
Wanted to try kdirstat on ubuntu 10.04, but conflicted with pidgin, and didn't want to resolve that in order to install it:
sdoskurd@sdoux0072 (review_9849) Contacts $ sudo apt-get install kdirstat ... The following packages have unmet dependencies: kdirstat: Depends: kdelibs4c2a (= 4:3.5.8-1) but it is not going to be installed pidgin: Depends: pidgin-data (= 1:2.7.9) but 1:2.7.7-1ubuntu0+pidgin1.10.04 is to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
try gdmap, works well.