China Statistical Information Network www.stats.gov.cn In Chinese and English. Statistics of the government. Not the most up-to-date, but of good quality.
Ministry of Commerce www.mofcom.gov.cn In English and Chinese. Commercial information. Created by China International Electronic Commerce Center. About finance, trade and investment promotion in china.
Ministry Of Foreign Affairs www.fmprc.gov.cn/eng/ In Chinese and Enlgish. Information about foreign policy, flow charts, statistics about foreign affairs, etc.