what to delete in /usr

[caitken-Bm8TULXj0r/3fQ9qLvQP4Q at public.gmane.org]

Sometimes, now, when I open OpenOffice it hangs my business production 
computer. I checked for any partition that may be full. I found this: 

[chris at a800 chris]$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda1              1004024    254928    698092  27% /
/dev/hda3              2016044   1468792    444840  77% /home
none                    127696         0    127696   0% /dev/shm
/dev/hda2              2949060   2698768    100488  97% /usr
[chris at a800 chris]$ 

Clearly I need to lighten /usr 's load. What can I delete? The only programs 
I really use on the computer are Mozilla and OpenOffice but I don't want to 
delete programs that I don't know what they do or that other programs may 
rely on... 

Chris
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