Internet Relay Chat is a worldwide text chat service with many thousands of users among various irc 'networks.'
The Freenode IRC network has a #haskell channel, as of November 2005, we average about one hundred eighty people, and we have some excellent discussions.
As of 2005-10-28 our high water mark is 206 unique clients (though that's at least three bots, including [Lambdabot]).
If you point your irc client to irc.freenode.net and then join the #haskell channel, you'll be there.
Currently we have about half newbies learning from the experienced half, but any Haskell related conversation is welcome.
The IRC channel can be an excellent place to learn more about Haskell, and to just keep in the loop on new things in the Haskell world.