I wrote a simple IPv6 capable HTTP server for the ipv6EtherShield-library (see http://sites.google.com/site/ghoelzl/ipv6ethershield). The output on a browser looks like this:
You can find the code of the server at http://sites.google.com/site/ghoelzl/ipv6ethershield/ipv6_http_server.
Have fun! 