At a plenary session during the Internet Engineering Task Force (IETF) meeting in Quebec City, Canada two weeks ago, World IPv6 Day was rehashed at some length. It took place on June 8 this year, and Google, Facebook, Yahoo and others turned on IPv6 for 24 hours in an effort to flush out broken IPv6 setups. Immediately after IPv6 day, and again six weeks later, we noted that there didn’t appear to be much breakage to speak of.
Complete info at ars technica.