Ok, technically I’ve been doing IRC on my Mac Mini for quite awhile now, but I have to say that it’s a great experience.
I used mIRC for many years, but a couple MacUpdate bundles ago, there were too many good apps to be passed on. One was Linkinus, a great IRC client for the Mac. It basically does for IRC what iChat did for IMs. Color-coding, scripts, and GROWL notifications… Oh, my.
You can catch me (and other helpful folks) in #flex on EFNet, and #cfflex and #coldfusion on DALNet.