apt-get install ncdu

du -s * | sort -nr | head

$ df
Filesystem     1K-blocks      Used Available Use% Mounted on
rootfs          15136768   1618580  12884780  12% /
/dev/root       15136768   1618580  12884780  12% /
devtmpfs          240516         0    240516   0% /dev
tmpfs              49756       604     49152   2% /run
tmpfs               5120         0      5120   0% /run/lock
tmpfs              99500         0     99500   0% /run/shm
/dev/mmcblk0p1     57288     18888     38400  33% /boot
/dev/sda1      961433632 108173348 804422208  12% /home/stuff
$

tree -dh --du /

tree -dh --du -L 3 /

$ du -m | sort -n

$ du -k | sort -n