The New York Times Learning Network has an article on classroom activities to respond to what's happening in Haiti.
The article outlines a series of lessons on 5 themes:
The Google Blog has recent photos and remember Google Earth is on most of your computers. Open Google Earth. The Earthquake layer is in the "gallery" layer. It quickly shows all the recent earthquake activity in Haiti.
Thinkfinity has a good list of earthquake lessons for all gradelevels.
The Big Picture has two photo essays on the recent destruction.