[jeffool]

I don't know about know, but I remember being told as recently as a couple of years ago that id Software used it as an inter-office chat tool. I certainly have imagined its use at jobs before, even when I worked in call centers. It couldn't be hard to let the rank and file chat when not on a call. (Yes, they were oddly draconian about doing nothing, or reading a book, between calls. Forget your book and your day is ruined.)

[kybernetyk]

Around 2000 when I got out of school I was working as a programmer for a company that made J2ME mobile games.

They were sitting in the Netherlands and had hired a bunch of teleworkers. Mostly from Germany and Poland.

And whenever there were meetings (even with the bosses) we used IRC for that. It was pretty cool. You were also allowed to go AFK but you had to leave your client open to read the backlogs. (People knew beforehand if their active presence was required in the meeting.)