Bad idea, BUT it is possible to make a "Chat" button on the main page of bitcoin.org (here).
Then a Java IRC client is on that page so people will not have to install a client, or if they can't they can just chat on that page.
That's the closest thing what I'd approve of. (not like I'm that important, but what ever!
Anyhow, integrating other services in the Bitcoin client is bad.
Bitcoin is a finance application, not an entertainment one!
And in my opinion, it only stays a finance application.