IRC
I just re-discovered IRC. I wonder how many people use IRC these days. I remember using it back in the 93-96 era before I had graphics on my internet machine. Back then you had to know all of this Jargon and commands Like this page describes.
I started looking at The Freely Project the other day. This is a website about Using Open source software in Churches. They advertized their IRC channel and decided to fire it up again.
I looked at my Instant messenger, Kopete, and found that it had IRC support built in. So I set up the connection and bingo, I had a open line to Linuxy Church Techs around the world. Pretty cool deal. I wonder if IRC will go mainstream again anytime soon. It certainly is useful.