Watch out for URL blocking in China. www.gmwait.com has been blocked in China when I was back a few weeks ago. The problems with most of the solutions that re-proxy your traffic is that the proxy itself will be blocked - eventually by the great Chinese firewall.
My solution has been to set up my own computer overseas with SSH service. I then will need to connect to my own computer using Putty from China and tunnel back into my computer with RDP, or use Putty's dynamic proxy to browse directly.
The most important part though is that you need fairly fast internet connection in China and your computer overseas must be connected to a fast link as the traffic will be routed to your computer overseas and then routed to your computer in China.