I’ve always found sites which test IPv6 connectivity interesting. In 2005, I implemented the ipv6calc cgi software as part of a server-side include that reported which IPv4 or IPv6 address the visitor was using to visit the Web site. At that time, the number of IPv6-enabled visitors to the site per month averaged in single digits.
As mentioned in another posting (you can read it here), the “test-ipv6” software is available open-source. I’ve implemented a mirror of this site at http://test-ipv6.arbor.net and am hoping that there will be more than a handful of IPv6-enabled visitors per month. This Web site, based at Arbor’s engineering lab in Ann Arbor, Michigan, will provide the visitor with information about their IPv6 capabilities and readiness, with a score from 0 to 10.