Due to the constant trouble on chat, we've opened up an IRC. IRC is a place to chat, and many Wikis use it.
It stands for "Internet Relay Chat" and has many more functions than Special:Chat. You can quieten the room if an argument is going out of control, or just a single user. You can also kick and kickban. A kick allows the user to come back afterwards, but a kickban stays until a channel operator undoes it.
IRC is a lot easier for mods and admins to keep under control. It's also a lot better and spam doesn't always necessarily flood.
We'll be switching officially to IRC soon (i.e. disabling chat and using that), so be prepared for when that happens.
You can visit this page for basic commands. There are instructions on the main page on how to log in and register an account, if you'd like to do so.