My dedi's host doesn't have IPv6. My cable internet provider (Comcast) has started IPv6 trials, but I can't figure out how to join them. This is unfortunate.
On the other hand, I'm in the T-Mobile IPv6/IPv4 dual-stack trial, and my university provides globally-routable IPv6 addresses over wireless. And if I wanted, I suppose I could either run Miredo for tunneling, or get a tunnel from Hurricane Electric.
Personally, my favorite IPv6 test is the dancing turtle.
