This is an unobtrusive notifier for Colloquy.
It puts an icon on your menubar that changes color when you have been mentioned or received a private message.
Growl and/or the bouncing dock icon were too distracting for me.
To install:
1. Install PyObjC: sudo easy_install pyobjc
2. Install plugin: mv MenuBar.py ~/Libarary/Application\ Support/Colloquy/PlugIns/
I know nothing about PyObjC. The code is mostly borrowed from the MenuBar Status plugin here: http://colloquy.info/extras/details.php?file=45