I have added a new feature to the blog template. You'll notice a thin coloured bar right at the top of the page.
If you see a red bar then you are using a legacy IPv4 connection. If - however - you see a green at the top of the page then you are visiting this site over IPv6. If you're sure that you've setup IPv6 but you still see a red bar then your IPv6 is most likely broken.
Now I'm interested in getting some feedback from you. If you reach this site over IPv6 then please post a comment about the service provider that you are using or the tunnelling mechanism that you are using.
Looking forward to some feedback.