Yeah I've seen the www.v6.blah
or ipv6.blah our main issue is that we have clients on trial and need to be able to test it without forcing users to change their habbit's. We've had google whitelist our DNS servers which has helped alot (ten fold increase in v6 traffic) and now looking at other popular websites to do the same. I've been asked to look into messing around with the dns zones to work around it but thats very dangerious and not good netiquette.
You have to get every site you're interested in to whitelist your DNS servers, or set up a forward only zone for each domain pointing to a DNS server which is already whitelisted, or one for each domain which serves up both A and AAAA records (presuming said company/site provides such a DNS server to point to).
I'm actually not sure how most sites do the whitelisting. I'm sure they use something like ACLs to control which zone view a resolver gets answers from, but whether they all use the client source address, or the server's destination address to choose the view is the question.
If I were setting something like this up, I'd probably do both. I'd set up anycasted DNS servers which have both a IPv4 only and a dual-stack zone view. I'd have two sets of anycasted addresses, one which selects the IPv4 only view, and one which selects the dual-stack view via ACLs matching the corresponding server destination address.
With that set up, I could control access to the view based on either the source IP of the calling client via ACLs (whitelisting on my end), or
allow DNS resolvers to control it from their end by using the second address of my DNS server(s), which would select the dual-stack view.
Then you could put up instructions on your site saying "If you want to access us dual-stack, either send in a whitelist request to here, or point your DNS servers to these addresses for our domains if you want to do it yourself."
Whether various IPv6 enabled web sites use either or both methods is unknown to me. I think you pretty much have to contact each company individually to find out how to do it with their sites, unfortunately. :|