Oh god I loved Server Side Includes. I ran a Tiberian Sun / Red Alert 2 site a years ago and had like 30-ish pages of content. Each had it's own navigation bar. Now imagine the time it took me update if I added a page or changed the navigation.

To make the long story short, I went to IRC (webmaster.com #ra2 - i think), people there introduced me to SSI. Then a few weeks later, they introduced me to Newspro (a few months/years later, it was renamed to Coranto).