Well, I think Ubuntu has trashed my systems. I was getting random IO errors and file system problems (have you ever been forced to use xfs_repair in a week more than 7 times?).
The day before yesterday I bought a new disk (IBM/Hitachi, 2.5", 80GB). I set up Ubuntu once more (hoping that the Warty RC fould fix my problems), but it didn't (I wonder whether any of the Ubuntu developers is using XFS). So I still have to trashed systems (my Athlon XP1500+ based Shuttle and my Powerbook) and a friend of mine told me that he needed to fix his XFS file system too. Guys, there's something definitely going wrong there.
So, while my systems have been trashed, I was working to get the TV out of the Geforce4 MX/440 running. I recall that this built-in device has been a very strong enemy when setting up this machine in march. I was able to see 2 movies yesterday without crashes, but the system is still very unstable, I haven't even been able to boot a Gnoppix CD and get into GNOME before X crashes with this device.
Debian Sarge just got installed on the Barebone, so it's on me to set it up now... (anything I should be aware of when downgrading from GNOME 2.8 to 2.6?)