I have set my repositories in /etc/apt/sources.list to be stable rather than have them set to Debian's testing or sid repositories.

Here is my /etc/apt/sources.list file:
With this type of repository setting I now have packages listed in Synaptic as being Installed (local or obsolete). These local packages appear to come from a variety of sources, including sid, sidux, testing, and etch repositories.

One such package is libgnutls13, version 1.4.4-3+etch1. It orginally came from the etch repository but is now 2 versions out of date. If you remove this package through Synaptic, it will also want to remove package gnome-cups-manager, which is also listed as a local package.

What is the best way to proceed with these local packages? My goal would be to have as many of them as possible be changed to come from the lenny (stable) repository.

What happens if you
#apt-get install gnome-cups-manager or
#apt-get install --reinstall gnome-cups-manager

Result from apt-get install gnome-cups-manager:

gnome-cups-manager is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

Result from apt-get install --reinstall gnome-cups-manager:

Reinstallation of gnome-cups-manager is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

So it is only in Etch and not Lenny or Testing.
If you do not need it, you can remove it.

You could do the same with some of the apps in local, but the chance is that you won't be able to get them back eg xmms is not in Lenny.

If I remove"gnome-cups-manager" then I will also need to modify the antiX Control Center script antixcc.sh to remove/replace the"Setup a Printer" selection from the Peripherals tab.

Correct me if I am wrong, but since antiX Control Center is not installed from a package, therefore not subject to being updated by doing an apt-get upgrade, it should not cause future problems to manually change it.

Is there a replacement for"gnome-cups-manager" available in the Lenny repositories?

On"xmms", I noticed that as well that it is not in the Lenny repositories. Is"audacious" a viable replacement for it?

Some of the packages in the local apps list I have already removed and then installed with Lenny packages. (ex. gnuchess and links2). Since those packages can be considered stand alone, not supporting other software, I could not see how any collateral damage would occur.

Other packages in the local apps list appear to come from testing or sid, including conky, feh, fluxbox, rox-filer, roxterm, and slim. What problems will occur if those are to be reverted back to Lenny?

system-config-printer 'replaces' gnome-cups-manager and is in Lenny repos.

Yes, manually change the antiXCC and yes, no problems with it getting upgraded.

audacious is a viable replacement for xmms, though it brings in a lot more dependencies.
(IMO xmms produces better sound than audacious, but unfortunately is no longer supported)

Reverting some apps back to Lenny from sid or Testing(now squeeze) should be ok, but check first, except that slim will no longer be able to autologin.

Thank you for the feedback.

Right now I have 36 packages categorized as local or obsolete in Synaptic. A portion of them are from sidux (ex. ceni and ceniwrapper) and other places (ex. absvolume and dillo). There is no hurry on my part in replacing or reverting the packages, so I will just do 1 package at a time, checking things out before proceeding on to the next one.

I made a backup of the partitions (root and /home) running partimage from the antiX live CD. Nice to have partimage available from the live CD.

If you don't need/want the packages then you can remove them, but you will miss some features that make antiX what it is.