You don't mention the platform..but...

In the NT world you may be able to use the PPM module included in activestate's distribution. Ideally you could setup your own depot, bundle your modules, and 'use PPM;'(and its various routines) in a script to install/manage your modules. You could use a NT schedule/at command to periodically run thescript ensuring that the modules listed in a text file are installed/current.

I'm not sure how reliable the PPM module is..I know while using PPM interactively I've run across some quirks/issues, so it may be better to use a cruder/more reliable method. Still worth a mention though.

toodlez - blueAdept