The Elgg Community: ElggChat

http://community.elgg.org/pg/plugins/jdalsem/read/122783/elggchat

Provides a chat/instant messaging feature based completely on the Elgg platform.
Start chatting from the profile icon of a user, or by selecting a friend from the friendpicker on the chattoolbar.
Invites and sessions will be shown on the chattoolbar.

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Features: 
 - Privately chat with everyone in the community
 - Special Chat Toolbar
 - multiple sessions
 - invite community friends
 - gTalk smileys

Georg Westphalen

a former physician specializing in creative concepts, outrageous comics, hilarious character designs and urban philosophy.