Hi,
I tried preupgrade without success, but at least it didn't destroy my old installation. :-)
I started package downloads with preupgrade 0.9.3-1, then killed it when 0.9.3-2 came out, upgraded and continued downloading. Total download size was about 6.2 GB, I have many huge games installed from Fedora 8 Everything. However, this version hung at the last download phase, which was fixed by 0.9.3-3. This version offered to reboot into upgrade finally, which I did. It booted into anaconda upgrade, which detected my partitions correctly. The problem that made the upgrade unsuccessful was that Anaconda doesn't pull the network settings from my old installation and I have an ADSL connection with a dump ADSL modem, not a router. The GRUB boot line for preupgrade is this:
kernel /upgrade/vmlinuz preupgrade lang=hu_HU.UTF-8 keymap=hu stage2=hd:sda1:/upgrade/stage.img \ method=http://ftp.crc.dk/fedora/linux/releases=9/Fedora/x86_64/os
Anaconda stalled at "Retrying package download" because the network connection isn't established. Replacing the method= parameter with method=file:///mnt/sysimage/var/cache/yum/anaconda-upgrade i.e. to point to the download directory gave me a Python exception in Anaconda.
Best regards, Zoltán Böszörményi