I have restored my Debian repository, and for the beginning added fresh LXDM packages. Feedback is welcome, and will be forwarded to the LXDE Debian maintainer team.
To use my repo, first download and import my gpg-key, extend your apt sources, and install as usual:
wget -O - http://debian.strucom.com/debian.strucom.com.gpg.key|apt-key add -
echo deb http://debian.strucom.com sid main > /etc/apt/sources.list.d/strucom.list
apt-get update && apt-get install lxdm