From New York Times:
Chinese authorities have begun blocking access from mainland China to the Web site of The New York Times even while lifting some of the restrictions they had recently imposed on the Web sites of other media outlets.
When computer users in cities like Beijing, Shanghai and Guangzhou tried to connect on Friday morning to nytimes.com, they received a message that the site was not available; some users were cut off on Thursday as early as 8 p.m. The blocking was still in effect on Saturday morning.
But the Chinese-language Web sites of BBC, Voice of America and Asiaweek, all of which had been blocked earlier this week, were accessible by Friday. The Web site of Ming Pao, a Hong Kong newspaper, was blocked earlier this week and still restricted on Friday.
Read also Poll results are: NYTimes.com is being blocked throughout China (updated), and Tech followups on NYTimes.com blockage in China by James Fallows.