Presence and IntComm WG

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I just came across a couple of interesting links today.  Linux desktops
are integrating presence and instant messaging across applications.

Galago: Galago is a desktop presence framework, designed to transmit
presence information between programs. To put it in simpler terms, it
takes information on who is online and their away/idle states from an
instant messenger (such as gaim) or other similar programs and lets
other programs (such as Ximian's Evolution) to make use of it.
http://www.galago-project.org/about.php

Telepathy: IM/VOIP integration framework
The aim of this project is to provide a D-Bus-based framework that
unifies all forms of real time conversations, including, but not limited
to, instant messaging, IRC and voice and video over IP. It aims to
provide a simple interface to client applications allowing them to
quickly implement code to make use of real time communication over any
supported protocol.
http://telepathy.freedesktop.org/wiki/