df and du results on / strange

[wsa <wsa3@xs4all.nl>]

Running SID with latest packages
Nothing but problems here since last weekend...here's another one.
/ is ext2, all others are ext3.
I get a almost 100% use of /
But with du i'm geting nowhere near 1.9GB total which is the size
of my / , in total i get to 568419 used on / if i take du's output as truth.
The real thruth is there's about 130MB free space on / , cause trying to 
copy more that that to / results in 'no space left on device'.
What am i missing here?

Cheerios

df gives me this:

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda6              1984016   1878036      3568 100% /
/dev/hda1                15522      9216      5505  63% /boot
/dev/hda7              8596736    875368   7366336  11% /usr
/dev/hda8              4421384    570088   3668800  14% /home
/dev/hda9              1545036    185308   1295792  13% /var
/dev/hdb1             38448276  16203304  20291872  45% /share/vcr
/dev/hdb2             76928480  68151820   4868852  94% /share/music
/dev/hdc1             76944512     32828  73003072   1% /share/mp3

du -s /* | sort -nr | less :

84289532/share  (seperate partition)
842564  /usr    (seperate partition)
537284  /home   (seperate partition)
394203  /proc
152500  /var    (seperate partition)
98056   /root
52728   /lib
13152   /etc
9216    /boot   (seperate partition)
4496    /backup
3032    /sbin
2640    /bin
72      /dev
16      /tmp
4       /rcs
4       /mnt
4       /lost+found
4       /initrd
4       /floppy
4       /cdrom
0       /vmlinuz.old
0       /vmlinuz-2.4.22.20102003
0       /vmlinuz-2.4.22-1-686