I'm hoping one day that I'll be samrt and actually make a back-up of
my system before trying stuff like upgrading again.
You should always have backups. If you are running unstable, you
should make the backups NOW. You never know what is going to happen in
the next upgrade. Better be paranoid and have backups ready than
loosing months/years of work.
My OpenOffice.org 2.0 (converted from alien) seems to have vanished.
Why not just install them from unstable repositories (instead of
alien)? It is as simple as running
apt-get install openoffice.org
Unstable currently has openoffice 2.0.1-2 .
Also before upgrading from stable to testing or unstable, I think it
is a good idea to check
http://wiki.debian.org/StatusOfTesting
http://wiki.debian.org/StatusOfUnstable
hth
raju