Could you please add irc:// association to XChat Aqua? It would be super to click on irc links and have this open up rather than Colloquy (or it would be good to be able to switch back and forth for test I suppose).
Use this to set X-Chat Aqua as the irc handler.
RCDefaultApp is better, IMO.
More Internet and RCDefaultApp are both great programs. Unfortunately, neither of them is able to make X-Chat Aqua the default application for irc:// URLs. At least not in Tiger.
Thanks for the bug report. I just tried it and you're right, it's broken. I think I've just fixed it and if you email me directly (it's in the readme), I'll send you a test version to try.