Someone

[root@s2 ~]# du -kx / | sort -n | tail -20
82508   /usr/lib/rpmdb/x86_64-redhat-linux/CentOS
82516   /usr/lib/rpmdb/x86_64-redhat-linux
82524   /usr/lib/rpmdb
92276   /usr/share/locale
93976   /usr/bin
94188   /var/lib
95648   /usr/src/kernels
95720   /usr/src
100608  /usr/lib64/python2.3
106612  /usr/lib/locale
130104  /usr/include
160820  /usr/share/doc
174744  /var
230048  /lib/modules
242372  /lib
256260  /usr/lib
314260  /usr/lib64
497920  /usr/share
1465948 /usr
2047434 /