Great Resource
These flash interactive physical geology topics, for example (a) Rock Cycle Animation, (b) Weathering Animation, and (c) Sedimentary Rocks Animation, were origninally created for Houghton Mifflin Company. They are shown on the University of Kentucky site for promotional purposes only.
Great Earth Science Videos to entice students.
This site "Exploring the World of Earth Science" has tons of resources, including investigations and visualizations.
Earthguide has tons of resources, including, but not limited to, Earthguide online classroom, animations, quizes, visuals & data, links, and expeditions.