Oh, sorry, world IPv6 DAY. Some of us have been doing this over 9 years so you understand the confusion.
Seems to be the non-event we all wanted.
From what I can see there are various ways that some of the people testing things have ballsed up DNS slightly for the odd moment, or done IPv6 on IPv4 DNS servers (which is fine) or managed to mess up glue records a tad, but nothing that actually shows any issues with the concept - and that is what is important.
For us, I cannot even say that traffic levels are noticeably higher on IPv6 today. It is a tad spiky but often 10% of our LINX traffic (where all the IPv6 seems to go). May be more obvious this evening when residential use hits facebook on IPv6.
It was also, briefly, World blame IPv6 day this morning until we stamped on it. Every problem was "could that be because they have IPv6", even one of general (LCP monitored) packet loss. Soon sorted. They know better now :-)