so what is wrong with
WebBBS?
http://awsd.com/scripts/webbbs/webbbs_files.zip
.... well I see now, it is written in Perl
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my personal favourite is a mini flatfile BOARD at: phpjunkyard.com
DEMO
http://www.phpjunkyard.com/mboard/mboard.php
DOWNLOAD and Details
http://www.phpjunkyard.com/php-message-board.php
for a more advanced flatfile board, which I use now
see navboard at: navarone.f2o.org
Support FORUM uses navboard
http://navarone.f2o.org/forum/
DETAILS and DOWNLOAD
http://navarone.f2o.org/
http://sourceforge.net/projects/navboard
"Navboard is a php based web forum using text files to store data instead of using a database, compatible with any server running PHP 4.0 or higher, all the features of most major forum software and no installation needed."