We tried to run our own IRC server. It's not exactly that easy. For example, you also need to deal with authentication, as well as set up an IRC proxy just to get backlogs on reconnect. Never mind the fact that IRC doesn't have important features like inline images or nice iPhone apps with notifications, etc.
We tried IRC, GTalk/Jabber, FlowDock and Campfire, but all of them were kinda "meh". HipChat is actually totally rad. Try it out: http://hipchat.com/r/2zqso
I was going to call you out for recommending HipChat and then posting a referral link, but then I saw that the referral merely gets you a custom icon that they draw for you. Pretty interesting incentive.
For anyone who is wondering, for Android phones (not sure about iOS) there is an app called andchat which handles IRC extremely well, definitely worth checking out.
We tried IRC, GTalk/Jabber, FlowDock and Campfire, but all of them were kinda "meh". HipChat is actually totally rad. Try it out: http://hipchat.com/r/2zqso