THD Blog found an excellent resource on pricing for developing regions.
IFC discusses the NYTimes' feature of Save-The-World, Inc.
Roland Piquepaille discusses turning cars into wireless nodes. Can it save the world? Maybe if you figure out how to match this up with what the folks at First Mile Solutions are doing, for instance.
Got Milk and a Webcam? Make a 3D scanner, Hack a Day shows you how (with a video).
and a list of free university lectures from all over (hat tip Medgadget).