Looking for a no-charge BlackBerry IRC client? (or any J2ME device) I was and found jmirc. It is fairly basic and I feel that the interface is sort of clunky but it gets the job done. Current version is 0.96.
One of the nice features is that you can create profiles for various IRC host, channels and/or nicknames.
“This project started as a fork of Sverre Valskrå’s WLIrc but eventually led to be a complete rewrite project. Its aim is to be as small and lightweight as possible still trying to maintain the ease of use and all needed features. At the same time it tries to be some kind of hybrid implementing all the most useful features from other clients.”
Main info page: jmirc.sourceforge.net
Blackberry download: jmirc.sf.net/beta/jmIrc.jad