I've hooked one of my laptop's terminals up to the net, so anyone with IPv6 can telnet in and see it.
I've long wanted to be able to broadcast my terminal sessions on occasions when it makes sense. Like when I'm fixing someone's bug, or closely collaborating with someone distant.
I am also interested in finding things to host on IPv6. Right now, that means only people who care will be able to access it. So it seems the trick is to find places where that is a benefit. I plan to keep an eye out for more things like this.
(A side benefit of using IPv6 is that it makes it easier to serve content from my laptop, that moves from network to network.)