root filesystem almost full

LinuxManagers,

I can't figure out why my root filesystem is growing.  Here is what I have 
from the df command:

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda2              3555936   3282520     92784  98% /
/dev/hda1                97570      9323     83209  11% /boot
none                     46868         0     46868   0% /dev/shm
/dev/hdc1              4128320   1244832   2673700  32% /home
/dev/hde3              4142832     37916   3894468   1% /var/lib/mysql
/dev/hde5             19236308  13368708   4890448  74% /usr/local/backup
/dev/hde6            212707132 100291292 101610928  50% /var/ftp

performing a 'du --max-depth 1 -x' at the root gives me:
[root@JackStraw /]# du --max-depth 1 -x
16      ./lost+found
2072180 ./dev
88100   ./var
4       ./tmp
7500    ./etc
13392   ./root
1000964 ./usr
4732    ./bin
4       ./initrd
51664   ./lib
8       ./mnt
4       ./opt
12100   ./sbin
4       ./misc
3250680 .

So it looks like /dev and /usr are the culprits.  Any reason why these 
should be growing?  I am not installing anything.  Are there logs or 
anything like that that I can get rid of?  Also, why would i have so many 
files in the /dev directory?

Here is what is in the /usr dir:

[root@JackStraw usr]# du --max-depth 1 -x
52392   ./bin
333652  ./lib
3296    ./libexec
15296   ./sbin
381020  ./share
9452    ./X11R6
4       ./dict
4       ./etc
4       ./games
13892   ./include
2216    ./local
186692  ./src
3040    ./kerberos

Any help that you can provide would be much appriciated.  I fear that my 
system will start having problems when the root filesystem is completely 
full.

thank you,
-KindSol

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