I saw this while searching on Google:

http://sites.google.com/site/cc8974tw/files/ipv6notify.jpg

   And after clicked on the "Try it now" link, I was led to http://ipv6test.google.com/ :

http://sites.google.com/site/cc8974tw/files/ipv6test.jpg

It has been launched yesterday, as seen on Google Japan blog ;-)

http://googlejapan.blogspot.com/2011/06/ipv6.html

Exact!
http://ipv6test.google.com/
On this URL, I get different results each time I go on it (same browser, same connexion)
http://i.imgur.com/NVZvc.png
http://i.imgur.com/YF1fY.png

The test isnt working properly, I have a full IPv6 Stack and I can use all IPv6 enabled services (including googles) but the test always fails.