I don’t have anything to add about the horrific earthquake that hasn’t already been said elsewhere.
But, I’ve added a donation button to the right sidebar for Doctors Without Borders, an excellent non-profit group already working in Haiti when the quake hit. They are apparently operating out of makeshift clinics in the absence of functioning hospitals. Click on the button to help; other donation options are listed here.
*update* Highly Allochthonous explains the tectonics of the quake.