AnthroSpace

GIS, mapping, and spatial reasoning are the focus of Latitude, NITLE’s GIS Initiative. It promotes the use of mapping and GIS for the purposes of developing and enhancing a spatial understanding of liberal arts curricula.
The NITLE Geographic Information System Initiative provides resources to get started with GIS. Including free online geographic information systems tutorials.

Below are a few pointers.

Google suggests:

http://www.google.com/educators/p_earth.html

This is k12:

http://www.teachinghacks.com/2006/11/03/google-earth-as-a-classroom-tool/

From the Google Earth blog:

http://www.gearthblog.com/blog/archives/2006/08/back_to_school.html

An incredible impressive project (see the methods section), its outcome released in public domain.

http://www.shadedrelief.com/physical/index.html