Harness the Power of Jabber

All Forces has an awesome tutorial on how to use iChat's support for Jabber in Mac OS X 10.4 (Tiger) to communicate directly with Yahoo,  MSN, IRC and ICQ accounts without having 10 different chat clients open or having to use any other third-party messenger.

Why should you care about this? As Melvin says so succinctly in the preface to his tutorial, "You should care because it's open, free and it's seems to be the only way to bring Yahoo and MSN Messenger into iChat." That's a good enough reason for me. I rarely need to chat with people who don't have .mac or AIM accounts, but next time I do need to IM with a Yahooligan, this will make it much simpler.