The other day I configured a IPv6 address as tunnel via Hurricane Eletric http://www.tunnelbroker.net. Everything went smooth with my Apple Airport.
I got all IPs and a screenshot for my Airport from HE. Btw: my current internet provider is Cox. Cox does not offer IPv6 testing for residential services yet.
Afterwards I tested IPv6 connectivity with http://test-ipv6.com/
Other sites where you can see your fresh IPv6 address are: