Now you can test...
About Update-Notifier
I know it, and comes soon, i wait only of apt-sources-update 
Ok, let's go for a new test and a full report:
[root@localhost tmp]# rpm -Uvh apt-sources-update-0.3.1-7leiche2011.i586.rpm
Préparation... ########################################### [100%]
paquetage apt-sources-update-0.3.1-7leiche2011.i586 déjà installé
le fichier /usr/bin/apt-sources-update de l'installation de apt-sources-update-0.3.1-7leiche2011.i586 entre en conflit avec le fichier du paquetage apt-sources-update-0.3.1-7leiche2011.i586
[root@localhost tmp]# rpm -Uvh apt-sources-update-0.3.1-7leiche2011.i586.rpm --force
Préparation... ########################################### [100%]
1:apt-sources-update ########################################### [100%]
[root@localhost tmp]# sync
[root@localhost tmp]# sync
[root@localhost tmp]# [root@localhost tmp]# exit
exit
[melodie@localhost ~]$ apt-sources-update window:
If your network connection is not active, please
activate it now, then press OK to continue.
Click Valider :Valider (=OK)
Connection successful..
Retrieved new sources.list file.
Select acceptable repos age.... (I select the max)
It runs...
Select your preferred repos from the list... etc...
Select number online repositories (I select the max)
If you want to enable the repos for megagames ? (I choose No)
The following repository exist (my name and so... for PASS, I choose Yes)
The following pass repository exists:
# rpm
http://xxxxxxx:xxxxxxxxxxx@passrepository.com/pclinuxos/apt/ pclinuxos/2010 main updates nonfree kde4 games
Would you like to keep it? (I select Yes, of course)
The repo speed test has completed and
a new apt sources.list has been saved to your home directory.
Would you like to overwrite your current sources.list file?
(a back up copy of the current file will be made)
That starts looking better !
(Yes !)
Would you like to remove the repo-speed-test working directory from your home folder?
(Yes !)
Hum... so it won't start Synaptic anymore ? Is that what you are expecting ?