Google has started to initiate the enabling of their Youtube site over IPv6.
It is currently available to participants in their Google over IPv6
program, http://www.google.com/intl/en/ipv6/ .
The www.youtube.com user interface so far does *not* have any AAAA
published, but the *much* more important (traffic wise) image and video
:~$ host v1.lscache1.c.youtube.com
v1.lscache1.c.youtube.com is an alias for v1.lscache1.l.google.com.
v1.lscache1.l.google.com has address 220.127.116.11
v1.lscache1.l.google.com has IPv6 address 2001:4860:4001:402::10
Read more about it on the Ripe IPv6 Workgroup mailinglist