The following are a list of useful weblinks

U.S. Government:

U.S. Commercial Service Locations Worldwide
Department of Commerce
U.S. Commerce Department’s China Business Information Center
U.S. Department of Commerce Bureau of Industry and Security (Export Controls)
International Trade Administration
Overseas Private Investment Corporation (OPIC)
Small Business Administration
Standards News, Standards Notes, Fact Sheets
Tariffs and Duties
United States Trade Representative
U.S. Trade and Development Agency (USTDA)
Agency for International Development (USAID)
Department of State
Department of Energy
Export-Import Bank
Foreign Agriculture Service (FAS)
Office of Foreign Assets Control
Technical regulations and product approval requirements
U.S. Government’s Official Web Portal

U.S. Diplomatic Mission in China:

Beijing Embassy
Chengdu Consulate
Guangzhou Consulate
Shanghai Consulate
Shenyang Consulate
Wuhan Consulate
Hong Kong Consulate

U.S. Organizations in China

American Chamber of Commerce (Beijing)
American Chamber of Commerce (Shanghai)
American Chamber of Commerce (South China)
U.S.-China Business Council

China Government:

Invest in China
Ministry of Commerce (PRC)
Ministry of Commerce, Department of Foreign Investment Administration
Ministry of Foreign Affairs (PRC)
Quality Supervision, Inspection and Quarantine of P.R.C.

Other Useful Resources

Asian Development Bank (ADB)
APEC Tariff Database
China Council for the Promotion of International Trade
Council of American States in China (CASIC)
Public Sector Tendering Notices of the P.R.C.
World Trade Organization (WTO)
Link to Other Useful Export Resources

Internships & Careers:

U.S. Commercial Service Internship Program in China
U.S. Department of Commerce Job & Career Opportunities
U.S. Embassy Beijing Vacancy Announcement