Portable IRC Client for Mac OS X, that we want to share with you had a name: Portable Newspeak. This Portable Client of IRC would allow you to use portable device such as iPod, Memory Card, USB drive and others to store and the run it (need 2MB Free Space).
You can use your IRC Servers and channel list to Portable Newspeak also.
Download Portable IRC Client Newspeak
This Portable devices of IRC Client under GNU GPL License (Open Source) that would allow you to use it at free.
ps: image taken from http://www.freesmug.org/img/review/newspeak.jpg