Sure. Since it was asked, let me explain ipv6 tunnelling for you all.
First, IPV6 is a completely separate and "new" network from IPV4. You can only have an IPV6 network or only an IPV4 network or both. IPV4 is the "original" internet. If you ever have seen something like 192.168.122.22, that is an IPV4 (I)nternet (P)rotocol address. This difference is important to understanding a tunnel.
As the name implies, a tunnel goes through something. In this case, a tunnel takes the IPV4 that you get from you (I)nternet (S)ervice (P)rovider and carries the new IPV6 data across to through your tunnel to an IPV6 ISP to connect to the IPV6 network. SIXXS and Hurricane Electric are two of the free US providers that will allow you create an IPV6 tunnel so that you can get to web sites on the new network (IPV6 network).
I hope this helps. If you have further questions, I will be hanging out and will be glad to try to answer them.
John