Helpful sites for China travel:

Helpful unbiased opinions about China vacation and hotel at TripAdvisor.

Lonely Planet China online:
Travels tips to Beijing, Shanghai, Tibet, and Hong Kong

China map with major tourist cities

China maps and travel guide

Voyage en Chine

Tibet Train Travel

Useful Online Resources For International Tourists 

People’s Republic of China's Embassies in USA, UK, Canada, Australia, New Zealand or other countries. 
U.S. Embassy in China 
U.K. Embassy in China 
Canada Embassy in China 
Australia Embassy in China 
New Zealand Embassy in China 
For those from other counties, you can find your embassies and consulates here.  
Some travel advice from US state department, and Tips for Travelers to the People’s Republic of China
Tour advice from U.K. government 
Some travel advice from Australian government 

More China: 
Chinas Official Gateway to latest travel news, tips, travel guide, BBS, etc 
China National Tourism Administration and China National Tourist Office (US) offers comprehensive China travel information
China Heritage
The weather and climate information about the major tourist cities of China like Beijing, Shanghai, Xian, Guilin, Lhasa, Hong Kong, etc.
Victoria Cruises (USA) on Yangtze River 
A nice website for Chinese culture
Online Currency Converter - http://www.xe.com
Customized China tours & China City Guide