I would love to see this option in the notifications screen.  My contacts really love to change their display names all the time, and make them as long as they can.  If you choose not to include their display name or e-mail in the toast window, then you can set up a separate window for each contact with your preferred name for them instead, e.g. "Nicole is now offline."  This would take a bit more effort, but it would sure make things easier in seeing who did what!  Does anyone else think this is a good idea?