The authors of the Perl Template Toolkit book used Perl templates to write the book instead of a word processor. These freakazoids wanted to write it in POD. I call them freakazoids, but I use a very very small templating system I wrote for some of the docs I write at work to produce clean HTML output with automatically generated tables of contents. The temptation to extend my little system is staved off only by the foregone conclusion that a system that would meet my (rather particular) needs has already been written.