http://www.ietf.org/html.charters/impp-charter.html (The official IETF charter
etc. for instant messaging)
http://search.ietf.org/internet-drafts/draft-ietf-impp-reqts-01.txt (An IETF
requirements draft that encompasses notification)
http://webreview.com/wr/pub/97/06/20/feature/index6.html (Review of commercial -
free - implementations)
These are just a few. Maybe not even the best links.
Point is... if you think e-mail has a place in print job notifications (I'm not
saying it doesn't)... then you should agree that IM is even a more custom fit.
IBM Printing Systems