I had total failure in installing with the original FC4 CD's. The kernel just wouldn't support network install and would persistently crash during CD install.
Downloading and using the unofficial FC4 update 1 CD's however, completely cured this hitch. FC4.1 is now completely installed with everything that I've checked working well.
The only thing that I've noticed an issue with is that /etc/fstab keeps on changing the line for the Memory Stick to /dev/sda rather than /dev/sda1. As soon as I change it to /dev/sda1 I can automount memory sticks no problem. One reboot later - it's magically changed back to /dev/sda
Apart from that though - no problems with graphics, sound, network etc. Don't recall doing anything with the external CD-ROM since installation, but I suppose the actual CD install shows that this works.
P.S. On a side note, does anyone know where to get good replacement parts for VAIOs? I suspect the internal fan has just packed up as I nearly burned my hand when I went back to it after leaving it on for an hour. :o