I've got a modification on my phpBB at saltwarz.com
called chatmod that adds an IRC chatroom to the message board(pjIRC). I'm not sure if it would work on a geeklog site that has phpBB integrated into it, but anyone that is interested is free to download it from my site. I am NOT the author of ChatMod, and as far as I know there is ZERO support for it so try at your own risk. You can grab the file here
and if anyone wants to know it IS NOT easymod compatible...or atleast I've been unable to get it to work with easymod....all modifications have to be done by hand(or whatever).