This page should describe the steps needed to turn a debian etch installation into a debian-edu etch installation.
Add the following two lines to /etc/apt/sources.list
deb http://ftp.skolelinux.no/skolelinux etch local deb-src http://ftp.skolelinux.no/skolelinux etch local
As root, run
apt-get update apt-get upgrade apt-get install debian-edu debian-edu-config debian-edu-install
Execute some magic foo
FIXME