At first I saw it on boingboing.net; Authorities in China blocking Flickr images? and then on the Cnet. San Francisco Chronicle also writes:

Flickr not even flickering in China
Internet photo site says service is being blocked and hopes it's only temporary


The popular Internet photo site Flickr said that its service is being blocked in China, although the Yahoo subsidiary did not directly blame the Beijing government, which aggressively censors the Internet of material it deems subversive.


We had a same problem in Iran for about one year but we had a FireFox based solution: Access Flickr! plugin. This plugin is written by Hamed Saber and after installing it and restarting Firefox, let's you access the flickr once more :) Good luck.