Root partition full? CentOS

I'm running CentOS 5.4 and my / is full. I wanted to install gparted but in order to do that I must install Priorities and it's when I get an error saying / is full so I can't go forward.

Here's some output:

fdisk -l

Disk /dev/sda: 250.0 GB, 250000000000 bytes
255 heads, 63 sectors/track, 30394 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        2611    20972826   83  Linux
/dev/sda2            2612        3251     5140800   82  Linux swap / Solaris
/dev/sda3            3252       30394   218026147+  83  Linux

df

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             20315812  19365152         0 100% /
/dev/sda3            211196248  49228164 151066780  25% /home
tmpfs                  1552844         0   1552844   0% /dev/shm

I'm not using LVM.
Please advise.
Thanks

Answer

Can you use a bootable disc like RIP (rescue is possible) Linux and use gParted on that?

Make sure you have a decent backup of your data first. Never play with partition information on production systems with important data without known good backups unless you're ready to possibly lose data (although RIP linux discs also have testdisk to try retrieving data from damaged partitions if something does go wrong...)