Hugo at UNEP/GRID-Arendal was kind enough to share a press release on a project he is working with us. The focus of their center is to provide generally understandable representations of scientific information. Their new maps and graphics site is a clearinghouse of many of these representations that takes advantage of web mapping with some back-end GIS in addition to providing static graphics. Overall, this is a great resource and will probably be especially useful for the classroom.
Maps and Graphics at UNEP/GRID-Arendal
UNEP/GRID-Arendal Maps and Graphics library.