Package: www.debian.org Severity: normal http://www.debian.org/support#irc contains:
To connect, you need an IRC client. Some of the most popular clients are XChat, ircII, irssi, epic4 and KSirc, all of which have been packaged for Debian.
This is a little outdated.KSirc was removed with KDE 4 and is no longer supported. For KDE, I use Konversation: http://qa.debian.org/popcon-graph.php?packages=konversation (about 200 popcon votes) There is also kvirc, which apparently has more votes: http://qa.debian.org/popcon-graph.php?packages=kvirc
Both of these have more votes than ircII (~100) and epic4 (~15). So please replace KSirc by at least Konversation.