I once(about 4 months ago) did the most exhaustive search for web2IRC chat clients that I have ever done on anything. What did I find? All crap, unless you wanna pay 500 bucks for something nice.
Either you had to click a button to refresh the screen, the screen flickered, no options, didn't work, etc... I was thinking about buying some chat software and running an NT machine as a colocation machine. But, thats a lot of money.
In the meantime if you find something good and need an IRC network to link to, try Idealnet, either irc.d0rk.org or irc.icomnet.net. Those are the only two servers on there, not much usage, but thats good. No server splits, no lag. Anyway, just my 46 cents.
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Troy(Trekkan)
RPG-Files Webmaster & Owner
http://www.rpg-files.com