As threatened, I've posted an updated draft of my Jabber Client Developer's Cheat Sheet, now with an overview of how to implement conferencing (aka chat). I've chosen to focus only on the newer "generic conferencing" protocol, not on the old-school "groupchat".
The URL remains:
http://homepage.mac.com/jens/Jabber/JabberClientCheatSheet.html
Conferencing is quite complicated, and I've only just gotten it working in my own client this week, so there may well be errors or omissions! If anyone finds something wrong, let me know and I'll fix it.
�Jens
