Not sure if this forum is the correct place for this, but I just noticed today that these are unreachable:
irc.he.net
irc.ipv6.he.net
I'm guessing these are pretty low priority and just haven't been rebooted yet, after HE's recent datacenter hiccup a few days ago?
I rather like using IRC over IPv6, as it's a great way to test the tunnel, and there's a vanity/coolness factor involved when you see an IPv6 address in the user list

Josh