Actually working version of the midclean script is attached.

Matej
===================================
#!/usr/bin/python
"""Program to clean /var/cache/apt/archives folder from files for
packages which are not installed. It doesn't take any arguments.

   Copyright (c) 2005 Matej Cepl <[EMAIL PROTECTED]>

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without 
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

   The above copyright notice and this permission notice shall be
   included in all copies or substantial portions of the
   Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
   KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
   PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""
# $Id: midclean.py,v 1.9 2005-11-25 20:10:06 matej Exp $
import os,re,sys
try:
    testSet=set([1,2])
except NameError:
    from sets import Set as set
else:
    del testSet

root = os.getuid()==0
workDir = "/var/cache/apt/archives/"
# leave packages which are installed and those which are removed,
# but not purged.
searchExpression ='~i | ~c'

# get a list of all installed packages (see above for the
# explanation, what installed means in this context :-)).
currentlyInstalledRaw = \
    os.popen("aptitude search -F '%%p# %%V#' '%s'" \
    % searchExpression,"r").readlines()
currentlyInstalled = set(["%s_%s" % tuple(line.split()) \
    for line in currentlyInstalledRaw])

# get the list of .deb-files on our computer
os.chdir(workDir)
packagesStored = \
dict([["_".join(line.replace("%3a",":").split("_",2)[:2]),line] \
    for line in os.listdir(".") if line[-4:] == ".deb"])

# get a difference between what is and what should be installed
storedNotInstalled = set(packagesStored.keys()) - 
currentlyInstalled

# go remove what should be removed
for item in storedNotInstalled:
    filename = packagesStored[item]
    print "Removing %s." % filename
    if root:
        os.remove(filename)

# final reporting
if root:
    print >>sys.stderr,"Removed %d files." % 
len(storedNotInstalled)
else:
    print >>sys.stderr,"Only root can actually remove the files."

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