check out »www.tunnelbroker.net/
and the FAQ.
Essentially, it is similar to a VPN, in that all your IPV6 traffic is routed through he.net's Routers.
Not all routers support this setup. You can setup an individual workstation(Wintel or Linux) to connect via a tunnel session.
A router setup means that all devices(that support IPV6) on your network can use IPV6. Windows XP(with a service pack), Vista, 7 and 8(as well as most Wintel servers) support IPV6. Apple support it via OSX and IOS. Android supports it as do almost all versions of Linux.
I use IPV6 on my Win7, SUSE VMware session, Ipad, Iphone and Nexus 7.
www.tunnelbroker.net IPV6 tunnels are not encrypted in any way. All of the data is transmitted in clear text.