What about "Installed (local or obsolete)" in synaptic?
In a clean install this section is empty.
I think lots of the packages could be uninstalled.
(except sun-j2re1.5, win32codecs and flashplayer-mozilla and other "real" local install)
So how do I figure out which packages could be uninstalled?
For instance, I got a big bunch of python2.3 packages there as well as what I think outdated lib-packages.
Not essential, but when we talk about cleaning........