As everyone knows a lot of sites in china are blocked...wikipedia, tripod, geocities, some myspace pages and so on
Lately i've been told that vtunnel.com is a good one to get around it. The basic principle here is we get connected to a proxy server and from in there we surf anonymously as our ip address is masked(as ip address tells our location i.e. china). Now, I can't access vtunnel.com so i did some research and found quite a few sites which offer anonymous web browsing(just search it in google, you'll see for yourself). But most of them are blocked while some needs membership.
The good thing is I happen to find a program called tor which you can download here: http://tor.eff.org/dist/vidalia-bundles/vidalia-bundle-0.1.1.26-0.0.7.exe
and read instructions here on how to use it: http://tor.eff.org/docs/tor-doc-win32.html.en(for english) and http://tor.eff.org/docs/tor-doc-win32.html.zh-cn(for chinese)

UPDATE: Just go to http://anonymouse.org/anonwww.html and enter the site you want to visit. No brainer!