When I was in China in 2008, I found that Wikipedia was blocked, as well (playing around with it) as various news sites.
But, I was able to download TOR and a Firefox plug-in for it, without any problem. So they are not really doing a thorough job, if it's that easy to get around.
I'm told that "most people" have enough stuff to read locally and don't put any effort into it. But I wonder if blocking things like You-Tube and Wikipedia will cause enough incentive that more people will try.
I wanted to share some videos with people who were visiting from China, and wrote up some advice posted at http://www.dlugosz.com/zeta/?p=88 .
Even when not blocked, running all the traffic through the central point causes noticeably poorer performance.