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How do you get started with IRC on a Mac?

Colloquy's an open source IRC client for Mac/iPhone/iPad!

(Disclaimer: I happen to contribute to Colloquy. In this case, it just means that I'd be delighted to look over any patches that anyone has. :)

I've always used Colloquy, it's an almost perfect client ;)

Textual is a very good IRC client for the Mac.