Latest beta version of Colloquy for Intel Macs is available, go grab yourself a copy if you want a lean, mean IRC client for Mac OS X :).
Colloquy 2.1 Beta (Universal Binary): The beta built on 7/9/2006 can be downloaded here (6.25 MB), made to run on both Intel- and PowerPC-based Mac computers. Older builds are archived here. The beta builds may or may not work properly — or at all. If there is a problem with a particular build, it may be worth trying again in a day or two.