Well, I've had another look at everyone's suggestions... and I think I'll have a go with using HTML::Template. For my situation, the other suggestions are probably over-complicated for the simple operations I will need to do.

I've installed HTML::Template and with the Monks tutorials, as well as the standard docs, I'm fairly sure I'll be able to create something fairly easy to use and maintain... and I'll understand it pretty well.

The only problem now is how to define the "structure/configuration" of the web sites... and for me, I'll probably store the info in plain text files. I'll probably manually build the files (rather than fiddling about with hashes or b-trees to maintain all the navigation paths) and use Config::Simple or maybe CSV files for the actual storage. I know - XML is de rigueur - but I've used CSV files a lot and I already have lots of code to manipulate CSV files.

Again, many thanks for everyone's help.