I don't remember an instance of Google responding to the Chinese government request of information.
They did follow the government guideline and censored their results but that's a very minor problem compared to the good Google did by just giving access to better english based information than Baidu for example.
All of this is not question of black and white and I respect Google a lot more than Yahoo based on the way they behave (Yahoo did help directly to the arrest of a political activist in China see: http://www.nytimes.com/2007/04/19/technology/19yahoo.html)
They did follow the government guideline and censored their results but that's a very minor problem compared to the good Google did by just giving access to better english based information than Baidu for example.
All of this is not question of black and white and I respect Google a lot more than Yahoo based on the way they behave (Yahoo did help directly to the arrest of a political activist in China see: http://www.nytimes.com/2007/04/19/technology/19yahoo.html)