Being reported all over the newswires: CNN, AP, NPR, NBC, Reuters, BBC. Link below is from FlightAware:http://flightaware.com/squawks/view/1/recently/popular/40633/Malaysia_Airlines_says_flight_MH370_from_Kuala_Lumpur_to_Beijing_lost_contact_with_air_traffic_control
Reports are that it lost lost contact with Subang ATC, but only had 7.5 hours of fuel onboard. It's a 6 hour flight for its route: WMKK-ZBAA (Kuala Lumpur - Beijing). So you may want to have a look in the archives for any activity for MAS370. No doubt the media is looking for this right now.