The National Bureau of Statistics of China maintains a web site in English.
China Statistics is a monthly economic database going back to the year 2000.
The University of Michigan maintains a site for China statistics.
The US-China Business Council has a sute for China statistics, mostly trade related.
The US Census Bureau maintains Trade Statistics for US-China trade.
The China National Tourist Office keeps tourism related statistics.
The Chinese Ministry of Commerce publishe statistics on trade and foreign investment.
Many of the sites on the Global Sites page also contain information about China.