I'd be up for that too.
I've been on Ratchat (on Skotrat.com) from work before as it has two modes, full graphics, and text mode.
But it would be nice to chat to all the Oz brewers, rather than pissed yanks as it is their night-time.
irc is a great platform for chat(spent too many years there), unfortunately 99% of admins block the irc ports by default(bastards), whereas a dedicated coded html based chat doesnt send up the same sort of alarms and connection problems for those at work.
I am unable to get onto irc here through Mirc but can get onto efnet fine with that web-based irc chat. Thats what I think I am currently going to look at for AHB's chat (unless someone can point me to a fast and decent html/mysql/php/etc chat script???)
I feel there are certain features that you have to look for in a chat board.
There are the obvious ones that have already been discused such as text based modes (eg not obvious to the boss), but also full featured ones that allow you to post/link to picture and external content.
Likewise the ability to tunnel through corporate proxies. I know this is a lot to ask from a single and freeware style of a product, but it is these limitations that would stop it from being something that was able to be used by the greater community.
As mentioned in a previous post the closest I've come across is Skotrat chat especially as it works also on port 80.