Galaxium is a multi-protocol instant messaging(IM) tool,it supports MSN, Jabber, GTalk, IRC and the next version will also support Yahoo!, AIM and ICQ. You can keep in touch with families, friends and colleagues immediately by using Galaxium.
Galaxium fuctions: contact list management, personalized custom (show portrait, state news, facial expressions, etc.), file transfer, MSN, and Jabber (+ GTalk) session support, themes and GStreamer audio.
Galaxium is built with Mono, it requires some depandences on the installation with a little trouble. If you are interested to try it,you can see the instalation guide here :http://code.google.com/p/galaxium/wiki/Instructions