I think it should be required for any gathering of tablet users. Great way to chat with people in the room, and put names to faces.

I also would love to get Windows people using this. You can download Bonjour for Windows here; does anyone know of a Windows chat program that can use the protocol?

EDIT: Yes, it looks like Pidgin for Windows can do it. No excuses for you not to have this on any and all of your laptops now!