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ationalatlas.gov™ contains a remarkable range of products and services to meet the diverse needs of people who are looking for maps and geographic information about America. Dynamic maps are innovative illustrations of geographic phenomena. We combine the science of mapping with today's multimedia to offer maps that are useful, understandable, and that stimulate interactivity.

Great game for helping students understand vectors, forces, mass/acceleration relationships, solar systems. It would take a teacher willing to let students explore some (and maybe have some fun) but very easy to connect vector forces to the activity. 

Great new mapping tool from National Goegraphic. It's in BETA, but already very good tool.