I've now gotten around to deploying IPv6 for my personal site(s) and machines. So potentially people visiting this blog are using IPv6 right now!
The Debian Administration website has been IPv6-connected and aware for a year or two now, although over 98% of users continue to connect via by IPv4.
Handling IPv6 & KVM wasn't too difficult at least, although I've done the simplest possible thing I could do, route a /64 to each guest and don't worry too much about it.
(The host machine has a /64 allocation of its own, and we've been granted an /48 allocation so we're not liable to run out. Ever.)
ObQuote: "You're not seriously gonna believe this man, are you? Are you? HE ISN'T EVEN FROM 'ROUND HERE! " - Hot Fuzz