/ out of space - what to do?

I am running FC2 and I have been keeping my updates current. Recently, I ran
out of space on / and I can no longer do any updates. I have checked
/var/log files, etc and everything appears to be in order. Here is a df of
my system

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hdb2              4031560   3764916     61844  99% /
/dev/hdb1                99043     24529     69400  27% /boot
/dev/hdb6             20181400   8096684  11059532  43% /data
/dev/hdb5              1007960     61404    895352   7% /home

What should I do?

thanks
Syl