So now my house is 2001:4978:1a0::/48 on the IPv6 Internet and I'm posting from my wireless workstation with IP 2001:4978:1a0:0:204:4bff:fe04:18f4. Best of all, it is entirely without NAT! Speaking as a user and as a network engineer I absolutely hate NAT.
Now I just need to figure out how to make stateless autoconfiguration or DHCPv6 work so I don't have to keep executing obscure Windows CLI commands....
[Edit @2013:] Or, if WhatIsMyIPv6 is giving you trouble, you can try http://www.runningipv6.net/what-is-my-ipv6-address.php