The problem with a BNC is that you need an account somewhere (to run the BNC) =>>
if you dont have one, looking on yahoo or google wont help you.
There was a nice cgi (i think its called "cgi-irc") that does the job for you if you have a homepage somewhere. Undernet had a link on www.undernet.org which allowed you to stay on irc trough your web browser.
It also might help you to get a free shell which allows you to irc (i think hobbiton.org does that). Just look for "free shell" on google or yahoo and keep in mind that most free shells dont allow you to have background processes (like BNC)
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