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In the portal you'll find a dynamic textbook, lesson plans, widgets, interactive Demonstrations, and more built by Wolfram education experts. Absolutely a great resource. Builds in representations, applets, explanations of variable use etc. Great tool.  Since it is in Beta, I am wondering how long it will be free and what their plans are for the future. 

PHYSLETS were developed at Davidson University by Wolfgang Christian. They are java applets that can be called from some javascript code in a web page. The links below contain physlets written or adapted for use at LTU, Lawrence Technical Univ., by Dr. Scott Schneider

ZoomIt is screen zoom and annotation tool for technical presentations that include application demonstrations. ZoomIt runs unobtrusively in the tray and activates with customizable hotkeys to zoom in on an area of the screen, move around while zoomed, and draw on the zoomed image.

For those of you looking for ways to expand your writing to demonstrate ideas, here a few worth exploring. 

Simple science demonstrations for middle school science classes.