I've been toying with the idea of making a website for facilitating PBEM play. Basically modelled on SEIV's PBW system, it should allow the host to upload the current turn file to the website, and after correctly identifying themselves, players would be able to download their relevant turn files, and after doing their turns, upload the .2h file to the website. This means that all players can know who has or hasn't played which helps to create some peer pressure to speed up games a bit.
I was planning to do it with PHP / MySQL. Any one think this would be useful? I wonder how hard this would be. I already have a modded phpBB forum running on my website that allows photo uploads/downloads.
Edit: Sheesh, Rowlff beat me to it.

Great minds think alike. Yeah, that's my excuse.