What can you Do in the IPv6 Internet

There are multiple business sites available over IPv6:

http://ipv6.google.com (during the Networkers event, www.google.com should also be available directly over IPv6 thanks to Lorenzo and Erik)
http://www.vyncke.org/countv6/stats.php (statistics about IPv6 enabled browsers)
http://www.6diss.org/ (a EU funded project to help education about IPv6 -- Cisco was part of this project)
http://www.6net.org/ (a EU funded project to run an IPv6 production network -- Cisco was part of this project, Gunter van de Velde was a key member)
http://www.ripe.net (the European Internet Registry)
http://www.ietf.org
use Binary News Reaper to download NNTP news article over IPv6 with newszilla6.xs4all.nl as NNTP server over IPv6

On a less serious way of life, Sixss has also a list of IPv6 cool stuff and of IPv6 toys.

On a less serious note, thepiratebay.org supports IPv6 BitTorrent trackers and peers.