Any chance of a chat module for the forums?

I go to a few forums that have a chat feature on the main page which opens up a seperate java window allowing for some free for all discussion.

Is there any reason why we dont have one here? From my understanding they dont cost that much to add.

This would be a very cool feature as it would allow for some real time arguments, lets say, about the specifications of the next iPod etc etc.

I'm new, maybe this already has been trialled, but yea, i was just wondering.