I've used the java and web based chat software before and never did consider it up to snuff with a true IRC server. The communication just feels disjointed but maybe that's because I started with regular IRC.
Anyway, I have my own servers so I put up an IRC server for folks here (and anyone else interested in canard chat) at www.tribalrage.com, port 6667, room #canards. Just a heads up, that's the standard port for IRC so your client may not specifically ask for the port # (it should assume 6667 for the initial connection attempt on its own).
If you run some flavor of unix, you already know what irc client you will use.
If on Windows, there are several clients but I myself am not familiar (some like mIRC).
On OS X, I tried and liked Colloquy and it meets my needs for chatting.
Googling for any of these should return a bunch of results.
Anyway, it's available, it's free, there are no ads, and it's a full chat server that can communicate with any chat protocol on just about any device, so people can connect however they like.
Use it or not, it's always available (unless I cook the config but remember, just like message boards, you have to check every so often to catch people online. Some people never disconnect, and that's fine too.
Dustin