JMS, together with the component Articles Sharing for JMS, is going to save me a whole lot of time installing and maintaining 50+ related sites. There is detailed documentation on the product web site, which describes the different ways to configure JMS, as well as tutorials on how to install JMS.

The Articles Sharing component allows us to place all common content in a one Joomla installation and then create menus/links in each related site to this common content.

But the best part is that I have never ever experienced better service and support than what I have been given by Edwin! Hats off to JMS, Articles Sharing for JMS and Edwin!