IPv6 testing site from Comcast or public

World IPv6day by The Internet Society (ISOC) is on June 8, 2011. If you are comcast user, test your IPv6 capability of your network.

or public test

Ping Tests
My Windows 7 computer was able to ping (ICMPv6 message types 128 & 129) all of these sites and IPv6 was being used by default.

C:\>ping -6 www.google.com
Pinging www.l.google.com [2001:4860:4001:803::1011] with 32 bytes of data:
Reply from 2001:4860:4001:803::1011: time=35ms
. . .
Ping statistics for 2001:4860:4001:803::1011:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 35ms, Maximum = 57ms, Average = 46ms

Visit The Internet Society (ISOC) to get more info about World IPv6day.