The Chinese government has changed their long-standing stance against Wikipedia, which is among many other sites that have been filtered for a long time to prevent people inside the country from viewing. Now, without any announcement, they have removed the ban on the site, opening Wikipedia up to many more millions of people. This is good news for both the Chinese people and Wikipedia itself, which no doubt can gain from their input. Being a community-driven and community-maintained site, it only helps to have more hands helping the process. Some say this may spark other changes:

The move hints that China may be loosening its control of public access to the Internet and other forms of media. The country's tight grip on information access is legendary. It employs tens of thousands of censors to watch over the Internet and maintains strict limits on what can and cannot be published and viewed by its citizens -- with information that reflects poorly on the government at the top of its objectionable content list.
Some speculate that likely the site isn't completely unblocked, but it is encouraging to see any progress at all. Many other companies, including Google, Yahoo and Microsoft, all voluntarily filter certain contain for pages served in China per government requests. Those that don't comply can't do business there, and get simply filtered out.