In case anyone is interested in how to begin writing a forum in PHP if you don't have database support, I created a very basic forum on my personal website
Jolly Roger's Ship. Go to the Forum page and check it out. Then just post back here if you'd like to see how I did it. It works with 7 separate PHP files and 1 include file. The server won't allow the code to place cookies so it sends out some warnings, but the post still goes through.