When using Gparted on the live CD, the program operates normally, but when one attempts to apply changes, an error message along the lines of "Cannot stat device 'sda': No such file or directory" comes up. It seems that the apply phase of gparted looks for the block device in the current working directory rather than finding it by its full path. As would be expected, running `cd /dev; gparted` from the terminal causes gparted to function normally
Unfortunately the gparted version on the live-disk have this bug in it, which has already been fixed in an updated version in F-8 and F-7. A quick way to work around this bug while using the live cd is to download the updated gparted (assuming you have access to the web) at http://download.fedora.redhat.com/pub/fedora/linux/updates/8/i386/gparted-0.3.3-14.fc8.i386.rpm . Right click on the downloaded rpm and select 'Extract Here', this will extract the contents of the rpm in a folder named 'usr' in the same directory where the downloaded rpm is; browse in the extracted 'usr' directory to 'usr/sbin' and copy the gparted binary there to your systems /usr/sbin/ . Alternatively, if you already have a Fedora installation (or have access to one), you can recreate a live CD with the updated gparted for yourself.