With pIRC you can connect to IRC with your PSP via WiFi. The program has been coded by bakablah. Changes:

Fixed another bug which some users complain that it does not work with some specific irc servers, it is found out that the new channel joining method didn’t take into account of some irc server pings the user initialy while some don’t, hopefully this will provide more stability then all other previous versions

Source code included with added commentsand findings

http://forums.qj.net/showthread.php?t=26814