I think there are still free web-based chat clients that you might be able to nab and add, though... that could bring up its own set of issues that'll open a whole new can of worms.
Just a thought.
I prefer that 'real time' chat be done using IRC -- it's there, it works, and it's one less thing to look after. :P
Thanks for bringing it up though.Â If there's a lot of demand for it, I might consider it or something like a shoutbox.Â
Ah, I see you have address this from my other post. Cool!