A truly horrifying event -- if you know of anyone in the affected areas, please give them your help and support. For those in the US, you can text REDCROSS to 90999 to donate $10, or contact your local Red Cross post. Google has also set up a Person Finder to help reunite missing persons with loved ones.
The New York Times has maps of the reach of the ensuing tsunami; I'm thankful the rest of the Pacific rim wasn't affected by the devastation it wrought on Japan. The Big Picture has a heart-wrenching series of photographs of the impact.
Our thoughts and hopes go out to everyone affected by this force of Nature.