Use IPv6 to bypass GFW

First, of course, you have to get IPv6 access and GFW at the same time. The best practice will be to be physically in China. Then no matter where you go, the greatest firewall in the world will protect you from unhealthy sites like wikipedia.org, bbc.co.uk and blogspot.com. The IPv6 access is trickier to obtain. The IPv6 access service from go6.net and the website itself are banned, so you will have to find an IPv6 tunnel broker or VPN service provider yourself. Most of the other providers requires you to register and provide genuine personal and usage information. Sixxs.org even requires you to write a proper article which will be reviewed by human! Among them a good choice will be he.net. Their network is fast and you have about 10 tunnel broker servers to choose from. The registration is relatively simple and get your tunnel right away. The only problem is you have to manually update your IPv4 address if you are using dynamic address.
After you have established the connection to IPv6 network, try access ipv6.google.com. If you see the page, then congratulations and process to the next step. If not, check if your DNS supports resolving IPv6's AAAA records. OpenDNS.com provides free DNS service that is safe for this purpose.
The third step is simple: when you are trying to visit a banned site, add ".sixxs.org" after the domain name in the url and press enter. E.g. change http://bannned.site.xxx/bad.page to http://bannned.site.xxx.sixxs.org/bad.page. The service is reasonably fast and GFW currently does not scan IPv6 traffic.
I have also written an URL script to do this for you:
javascript:var%20loc=document.location;loc.replace(loc.protocol+"//"+loc.hostname+".sixxs.org"+loc.pathname+loc.search)
You can bookmark this url and click it each time you want to go through IPv6.
You can also use the script with Greasymonkey to make the process automatic.