Partitioning before reinstalling

[Error403]

I think my FC5 installation mucked up and now I just want to reinstall FC5 over. But I think that will erase my partitions, so how do I resize/move my personal stuff to a safe place? I have over 100GB of data and my laptop only has 20GB left, so backing up to my laptop is not really an option I'm looking for a ondisk/partitioning solution, if possible.

Here's what df -h gives:

[phil@localhost ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      229G  137G   80G  64% /
/dev/hda1              99M   59M   36M  63% /boot
none                  252M     0  252M   0% /dev/shm
[phil@localhost ~]$

and I want to at least save what's on /home/(all users) and /pub/ (a directory (I simply created on /)