Recommend me a good IRC client for OS X

I just got my brand-new iBook yesterday, but I'm not quite sure of what client to use for IRC. he;lp

X-Chat aqua is pretty nice.

Colloquy is the most user friendly. But I personally used X-Chat aqua because it's the quickest, most lightweight and stable, and especially most power-user oriented client available for this platform.

It's also fairly user-friendly for basic functionality, especially if you've used mIRC (or better, Xchat). And it's Aqua-ized so it looks nice.

irssi