I am going to implement multi user chat support for the ICQ, MSN and Yahoo protocols within the GSoC 2008.
Maybe someone could suggest me a good starting protocol. I've found out that JOscar, the lib for ICQ/AIM, is really bad documented, but I am not sure if the other are better documented, so feel free to suggest me any of those three protocols.
If anyone have a 'kickass' group chat feature he/she wants to see inside the sip-com, please write a message to the dev-list (or directly to me).
Thanks in advance!