Synchronizing Debian package???

[John Clark <jclark@metricsystems.com>]

I have a number of machines that have a number of different packages 
installed, and even
with machines that have the same package, they may be at different 
revision levels.

Is there some 'niffty' way to synchronise these systems?

On thought was to use 'rsync' on the /var/cache/apt directory, getting 
all packages on
the various machines, and then somehow use some magic incantation to get the
packages all installed on the systems.

Is there some other way, and of course a 'manual' apt-get for all 
packages on each
system is tedious and lending itself to failure to have all systems 
synced...

Thanks,
John Clark.