Apt-dater is a relatively new utility that allows easy package management of multiple Debian servers from a central control server. I wrote up the necessary steps below, as the existing instructions (http://www.ibh.de/apt-dater/) are slightly unclear on a couple of things.

We run Debian stable (currently lenny) on many servers. Apt-dater is new enough that it is currently only available via the lenny-backports repository. (NB: in what follows I assume knowledge of basic package management and ssh configuration. Help with both of these is widely available on the 'Net.)