Remove packages by apt-get --purge remove package_name. Those configuration files that are still existing have some of your own configurations and are so not removed. You can remove them manually.

Don't forget to install and run deborphan after removing packages. There's always left some librarys after removing that are left 'orphan' (no program needs them). You can remove also them. If you have many orphan files do like following:
Code:
deborphan packages
apt-get --purge remove `cat packages`
rm -f packages

-tapsa-