I am a user of KDELirc (aka irkick) and I found that there is no port planned for it to KDE 4 :-(
I'll try to do it myself, and this will be a great challenge, as I have never programmed something using KDE libs nor Qt 3 (well, I did the examples... and then jumped to Qt 4.0.0 :-) ).
If someone else is willing to help, please feel free to contact me.
Update: now I learnt that irkick it's just the kicker applet, and KDELirc is the server behind it. Good, I'm progressing ;-)