apt-get dist-upgrade doesn't downgrade to stable

[Mohammed Sameer <Uniball@gmx.net>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,
I have a mixed system (stable+unstable) and wanted to downgrade to stable.

here's my /etc/apt/preferences

Package: *
Pin: release a=stable
Pin-Priority: 1001

and /etc/apt/apt.conf

APT::Default-Release "stable";

However
# apt-get dist-upgrade 
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
The following packages will be REMOVED:
  libfam0 
The following NEW packages will be installed:
  coreutils gcc-3.2-base libfam0c102 libgnome-desktop-2 libssl0.9.7
  libstartup-notification0 libstdc++5 
The following packages have been kept back
  libgtkspell-dev libgtkspell0 libpisock8 sylpheed-claws 
94 packages upgraded, 7 newly installed, 1 to remove and 4  not upgraded.
Need to get 46.8MB/50.6MB of archives. After unpacking 19.3MB will be used.
Do you want to continue? [Y/n] 

I had a look at the how to
What's wrong here ?
i did an apt-get update
but no use!

even removed my testing and unstable sources but no use

Can anyone kindly help please ?

- -- 
- ----------------
- -- Katoob Main Developer
Linux registered user # 224950
ICQ # 58475622
FIRST  make  it  run, THEN make it run fast "Brian Kernighan".
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)

iD8DBQE+LsO4y2aOKaP9DfcRAh8mAJ4jkmcKLYgl2FjHCqR8VhnXeRbvpQCfazzH
P6eSYYo0eQapUyqXcgSqAb4=
=JSHn
-----END PGP SIGNATURE-----