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.