Answer Worm - http://www.nrcs.usda.gov/feature/education/squirm/skworm.html
S.K. Worm answers questions about soil

The Dirt on Soil - http://school.discovery.com/schooladventures/soil/
Explore soil ecology and even take a virtual trip underground into the soil

Soil Biological Communities - http://www.blm.gov/nstc/soil/Kids/
Learn about the soil and the things that live in it.

Soil Science Education Page - http://soil.gsfc.nasa.gov/index.html
Contains information on soil including "soil songs"

Underground Adventure - http://www.fieldmuseum.org/undergroundadventure/
Contains information on soil habitats and include a virtual tour

What an Earth is Soil? - http://www.epa.gov/gmpo/edresources/soil.html
This site contains a list of quick facts about soil is and its uses