American aid is starting to arrive in Haiti:
— The Department of Homeland Security says "the Coast Guard Cutter Forward arrived off Port-au-Prince this morning. ... The cutter is equipped with a helicopter flight deck, satellite communications equipment, and the ability to provide coordination to military aircraft in the area. The Coast Guard cutter Mohawk is scheduled to arrive this afternoon. Two Coast Guard C-130 airplanes are flying the coast of Western Haiti this morning doing damage assessments and searching for people in need of assistance."
— NPR's Tom Bowman reports that the aircraft carrier USS Carl Vinson is now heading to Haiti from Norfolk, Va. It should get there tomorrow.
— At the Pentagon, officials just said a "large deck amphibious" ship with a Marine Expeditionary Force should be in Haiti within a few days.
Our coverage of the disaster began here yesterday, and will continue throughout today. NPR.org's coverage begins here.