Don't want to turn this into a political thread, but type in "Tiananmen" in Google USA and you get this: http://images.google.com/images?q=tiananmen
Type in the same thing in Google China and you get this: http://images.google.cn/images?q=tiananmen

Google's not the only one doing it. Yahoo! and MSN are in it too. I'm sure China is not the only one doing it though.