There was a nother thread about embedding an IM into a frontend. It hink it was AIM, but I don't remember the front-end.
Personally, I think it's a horrible idea.
Sure, you're responsible enough to not use it while driving. So are most of us. But there's that assclown that's stupid enough to try it.
That jackass will run over a little old lady and prompt a Jack Thompson-esque lawyer to attempt to outlaw vehicle computing, making our lives more difficult.