Using IPv6 Via IPv4
Prolog-X writes "``6to4 is an ad-hoc mechanism by which anyone can participate in IPv6 without having to make any arrangements to hook up to an existing IPv6 network.'' Nick Sayer wrote a short but useful tutorial on how to set up 6to4 on a FreeBSD system."
Microsoft has a stack available for Windows 2000, and it also supports 6to4.
Look here.