Google properties, Facebook, the remaining Microsoft properties, Yahoo, Cisco to name a few. Akamai, Limelight and a few other CDNs going full v6 production was/is a blocker for thousands of other sites going v6. This will help to push IPv6 much further along having so many large sites with AAAA records and no whitelisting games or special URLs.
IMO this should be a challenge for TSI to be much further along by June 6th. Have full production v6 for both ON/QC and AB/BC DSL customers by then. There is no shortage of CPE gear from D-Link/Netgear/Linksys and some other vendors as well as third-party firmware options to allow for v6 over DSL.