Dunno but if there is one, in my biased opinion, the chat software should be written in Flex. :)
hehehe i hope that someone will initiate that :-)
The best i've seen is the unofficial IRC channel on irc://irc.freenode.net/#flex. It's a quiet channel, but there are some very helpful people in there.
Also, there are a few Flex/Air based IRC chat clients (like Diomedes, an OSS irc project; among others).
Message was edited by: VooDooNOFX to add the irc client info.