I Thought that this was an interesting read:

As much as one-tenth of the internet's sites may be blocked by Chinese authorities as part of efforts to prevent access to information on dissidents, Taiwan, Tibet and other subjects, according to a US study released today.
The researchers found that among sites with "keywords" of "Tibet", "Taiwan China" or "equality", 100 per cent of the top 10 sites were blocked.
Here is the link:

http://www.smh.com.au/articles/2002/...950082382.html