Well, I finally came kicking and screaming into the 1990s by signing up for Yahoo! Messenger. I think I still prefer IRC, but apparently some folks prefer Yahoo and some organizations block port 6667. Strange, but true.
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IRC is mostly used, these days, for file swaping (warez, bookz, and some other stuff ending in "z"). That's why 6667 is blocked..
That being said, there's no IM equivalent for #java.