Links
Ctrips - A very handy website for booking inter-China flights.
english.ctrip.com
Harmonized Tariff Schedule - US customs tariff and duties.
www.us.itc.gov/tata/hts/bychapter/index.htm
Seat Guru - airline seating charts and regulations.
www.seatguru.com/
World Time Saver - World time and information for many countries.
http://www.worldtimeserver.com/current_time_in_US-CO.aspx
MatWeb - Material Property Data for most metals
http://www.matweb.com/search/SearchUNS.aspx