from the blog:
overheard recently in #moose
Openfire
Version: 3.4.1 ||
Release Date: 2007-11-12 ||
License: Freeware
Developer: Ignite Realtime
Openfire (formerly Wildfire) is the award-winning instant messaging server known for its simplicity, elegance, performance and extensibility.
- create your own private jabber server
- runs in the background
- supports gateways to allow connecting to MSN messenger/Yahoo messenger and logging into these services in iChat
Tags: wildfire , msn , jabber , messenger , im , gateway


Opinions:
Here's an useful link to set up iChat to communicate with MSN/Yahoo messengers.
http://blog.toonetown.com/2007/12/10-steps-to-multi-protocol-ichat.html