I've been quietly working on the script behind the site http://medichan.org/
The only reason I wrote it originally was because the free host I switched to after having no reason to pay $120 for a year of Dreamhost doesn't support Perl or MySQL. It uses only flat files and runs fairly well. I have some improvements to make before releasing the source code, but what do you think? It's kind of a mix between a text board like kareha and a very simple web forum.