This is a nice-looking bit of code (FoxtrotUniform++ for putting HTML::Template to more uses), but crazyinsomniac++ for pointing out WebMake. That is an awesome package that I've put to rather extensive use on my own site in the past. It has a lot of features that the average Perl geek would go googly over: a couple different levels of variable interpolation, metadata, and (of course) evaluation of Perl code in your templates. I'd say it's the best choice for generating a static site by hand.
That said, I'm not using WebMake on my site right now, because ... well, because I'm fickle, really. I'm always testing new tools and toys under the subject of "automatic site generation". I miss it sometimes, though.
"All you need is ignorance and confidence; then success is sure."-- Mark Twain