in reply to html template in a perl script
I'm sure what you are doing will work great for you, but I'm wondering how you are managing with only one template per page? I know that many have said this so far, but let me give you a more detailed account of why we are all questioning your use of only one template.
On any given page I actually load at least 4 templates. One for the top, one for the bottom, one for the left side menu, and one for the main part of the application. If I have an administrative block (for instance, the posting portion of a news page) then a fifth may load for that(depending, of course, on the currently logged in user). The only way I could see managing my site with a template in a DATA section would be to include the top, bottom and left menu templates, and then put the actual "application" info into the data section. I would genuinely consider doing that (it is a novel idea and I rather like it) but for two things: 1- I totally switch my display for errors(I have a template that gets called in place of everything else for error reporting) and 2- I have a team working on my site so I'm afraid that it might make CVS even weirder than it already is.
Good idea though, if you can pull it off.