Seeing the recent images from Haiti has given me the inspiration to build a rescue robot. I'm looking on making a relatively small robot platform that uses extendible tracks and linear actuators to help it traverse obstacles and fit into cavities in the rubble where a person could not get to. i plan on this being a relatively long project since i will be building most of the components myself, including the linear actuators. Maybe i'll put a tutorial up on how to make the linear actuators. Will put up more information and sketches soon!