IRC to IM gateway that support multiple IM protocols
BitlBee brings IM (instant messaging) to IRC clients. It's a great solution for people who have an IRC client running all the time and don't want to run an additional MSN/AIM/whatever client.
BitlBee currently supports the following IM networks/protocols: XMPP/Jabber (including Google Talk and Hipchat), MSN/Skype, Yahoo! Messenger, AIM and ICQ, the Twitter microblogging network (plus all other Twitter API compatible services like status.net)